CELLULOSE-BASED FILTERS FOR CANNABIS SMOKING ARTICLES

Abstract

Cellulose-based filters and smoking articles for cannabis use are disclosed. A filter body is formed from a cellulose-only fibrous web composed exclusively of natural cellulose fibers without chemical binders, resins, or synthetic adhesives. The fibrous web is mechanically compacted to achieve a selected density and formed into a filter portion having a length to selectively reduce harsh combustion particulates while limiting absorption of cannabinoids during smoking. In certain embodiments, the filter exhibits a normalized pressure drop of at least about 450 mm H2O per 100 millimeters at a volumetric airflow rate of 17.5 mL/s. The filter May comprise a multi-segment configuration including a first filter portion formed from the cellulose-only fibrous web and a second portion formed from a material different from the cellulose-only fibrous web and circumscribed by a common outer wrap. The filter may be fixedly integrated into or removably positioned within cannabis smoking articles including joints, cones, and pipes.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No. 63/754,497, filed Feb. 5, 2025, the contents of which are hereby incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention generally relates to filters for smoking articles, and more particularly to methods and apparatuses for manufacturing a cellulose-based filter for a cannabis cigarette and other cannabis smoking articles.

Discussion of the Background

Existing filters used in cannabis smoking articles are not specifically engineered to balance particulate reduction with preservation of cannabinoids. In particular, conventional acetate and cotton filters are typically optimized for tobacco smoke and rely on extended filter lengths and highly absorbent media, which can increase cannabinoid retention when applied to cannabis smoking articles Filters derived from tobacco applications also tend to rely on extended filter lengths and synthetic or highly absorbent media, which may be unsuitable for cannabis smoking articles. Conversely, simple paper or hollow filters provide insufficient particulate removal and do little to mitigate irritation associated with cannabis smoke.

Accordingly, there is a need in the art for a cannabis filter that reduces smoke harshness while limiting cannabinoid loss and avoiding the use of highly absorbent or synthetic filter materials.

BRIEF SUMMARY OF THE INVENTION

The present invention addresses these shortcomings by providing a cannabis filter that increases filtration density to selectively remove harsh particulates while reducing filter length to limit smoke residence time within the filter media. By mechanically structuring and densifying a cellulose-based filter medium without chemical binders, the disclosed filter provides a normalized pressure drop for a standardized length of filter media that enables filter configurations that improve smoke smoothness while limiting smoke residence time within the filter media. Engineered airflow pathways within the filter body further enable predictable draw resistance and compatibility with a range of cannabis smoking formats, including joints, cones, and pipes.

It is one aspect to provide a method of filtering combustion products from cannabis, comprising: drawing, by inhalation of a user, smoke generated from combusted cannabis through a length of a filter disposed in a cannabis smoking article; wherein the filter comprises a cellulose-only fibrous web having a density and length selected to selectively reduce harsh combustion particulates while limiting absorption of cannabinoids during smoking, and wherein a 100-millimeter length of the filter, when provided with a volumetric flow rate of 17.5 mL/s of dry, conditioned air, has a normalized pressure drop equal to or greater than about 450 mmH₂O.

It is another aspect to provide an article for a user to consume filtered cannabis smoke through an end of a mouthpiece, comprising: a cannabis-accepting portion; a path for air to flow from the portion to the mouthpiece; and a filter, wherein, during use when cannabis is combusted and the user inhales through the mouthpiece, smoke flows through a length of the filter, wherein the filter comprises a cellulose-only fibrous web having a density and length selected to selectively reduce harsh combustion particulates while limiting absorption of cannabinoids during smoking, and wherein a 100-millimeter length of the filter, when provided with a volumetric flow rate of 17.5 mL/s of dry, conditioned air, has a normalized pressure drop equal to or greater than about 450 mmH₂O.

It is yet another aspect to provide a filter comprising a first portion and a second portion, wherein the first portion and the second portion are circumscribed by an outer wrap and has a length, where the first portion comprises a cellulose-only fibrous web having a normalized pressure drop and a first length selected to selectively reduce harsh combustion particulates while limiting absorption of cannabinoids during smoking, where the second portion is a material different than a cellulose-only fibrous web and has a second length.

These features together with the various ancillary provisions and features which will become apparent to those skilled in the art from the following detailed description, are attained by the methods and apparatus of the present invention, preferred embodiments thereof being shown with reference to the accompanying drawings, by way of example only, wherein:

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

FIG. 1 is a sectional side view of a filter including a filter and an outer wrap;

FIG. 2 is an end view of the filter of FIG. 1;

FIG. 3 is a top view of a portion of a cellulose fiber web as used in the filter rod of FIG. 1;

FIG. 4 is a sectional side view of a filter incorporated into an end of a cannabis cigarette;

FIG. 5 is a sectional side view of a cone which includes filter;

FIG. 6 is a sectional side view of a tube formed from a rigid material and having an open end adapted to accept a filter;

FIG. 7 is a sectional side view of a smoking article including the tube and a filter; and

FIG. 8 is a sectional side view of an alternative filter.

Reference symbols are used in the Figures to indicate certain components, aspects or features shown therein, with reference symbols common to more than one Figure indicating components, aspects or features shown therein.

DETAILED DESCRIPTION OF THE INVENTION

The present disclosure provides a smoking article for cannabis and method of using a smoking article for cannabis that eliminates or reduces the “harshness” experienced by users when smoking cannabis. The smoking article provides for smoking combusted cannabis and includes a filter formed from compressed cellulose. As used herein, a cannabis smoking article includes any device or consumable configured to combust, heat, or convey cannabis material or cannabis-derived aerosol to a user. By way of example, and without limitation, the present disclosure describes the use of several cannabis smoking articles. It would be obvious to one skilled in the art to adapt the inventive filter into other cannabis smoking articles, either by replacing existing filters or by modifying a smoking article to accept the inventive filter.

FIGS. 1 and 2 are a sectional side view and end view, respectively, of a filter 100 having a length L between a first end 102 and a second end 104, and a diameter D, Filter 100 includes a filter body 101 formed from a cellulose-only material and an outer wrap 103 that circumscribes the filter body 101 and directs airflow through the filter body 101 between the first end 102 and the second end 104. The cellulose-only material of filter body 101 includes, exclusively, natural cellulose fibers without any chemical binders, resins, or synthetic adhesives. Outer wrap 103 is paper plug wrap, as is known in the art.

In certain embodiments, the cellulose-only material is a cellulose-only fibrous web, also referred to herein without limitation as a “cellulose fiber web” or a “web.” In certain embodiments, the cellulose-only fibrous web is generally planar and is rolled or otherwise formed into a cylindrical shape. In various embodiments, the planar cellulose-only fibrous web includes holes through the thickness of the web and/or features such as ridges or folds that facilitate the rolling of the web into a cylinder. In certain other embodiments, filter body 101 is a cylindrical-shaped cellulose-only material.

By way of example, and without limitation, generally planar cellulose fiber webs suitable for use in the present disclosure may be formed by depositing cellulose fibers as a loosely arranged, low-density layer, subjecting the layer to a preliminary compaction step to form a handleable non-woven web, and thereafter applying localized pressure at discrete regions using opposing rollers to mechanically bond adjacent fibers without chemical binders. U.S. Pat. No. 6,675,702 describes one example of such fiber web formation processes, the contents of which are incorporated herein by reference. The incorporated disclosure is relied upon for its description of mechanically bonded, binder-free cellulose fiber webs and patterned pressure-bonding techniques and is not relied upon for end-use applications or dimensional selections except as expressly described herein.

The pre-compacted non-woven web may then be subjected to a patterned calendering process in which opposing rollers apply localized, point-focused pressure at a plurality of discrete regions across the web. At these pressure regions, adjacent cellulose fibers undergo plastic deformation and mechanical fusion, forming permanent bonding zones that interlock the fibers without reliance on chemical binders. This process results in a cellulose fiber web exhibiting increased tear strength, durability, and dimensional stability while maintaining desired porosity and absorbent properties. The formed fiber web may thereafter be further processed into the products and systems described herein. The '702 patent discloses planar cellulose fiber webs having point-bonded, line-bonded, and embossed bonding geometries. In addition, the planar cellulose fiber webs may include through-holes through the web formed by puncturing the fiber web during or after a calendering step.

FIG. 8 is a sectional side view of an alternative filter 800 that is generally similar to filter 100, except as explicitly stated. Filter 800 includes a first portion, which is filter body 101, and which has length, L, and a second portion 801, having a length, L2, and outer wrap 103 which circumscribes both the first filter portion and the second filter portion. Second portion 801 is a spacer added to filter body 101 to increase the overall length and may comprise, for example and without limitation, a rolled tip. The two filter portions may be wrapped in a single outer wrap using a combiner, segment combiner, or multi-segment combiner as is known in the art. It will be understood by those skilled in the art that filter 800 may be substituted for filter 100 in any cannabis smoking article. In certain embodiments, the total length of L+L2 is from 18 mm to 25 mm,

FIG. 3 is a top view of a portion of a cellulose fiber web 300 as used in filter 100. Cellulose fiber web 300 includes one or more of a plurality of holes 301 that extend through the thickness of the web and a plurality of ridges or folds 303, wherein the holes and the ridges or folds may be provided independently or in combination depending on the desired permeability and formability of the web. The plurality of holes 301 increases the permeability of filter body 101 formed from cellulose fiber web 300 and the plurality of ridges or folds 303 facilitates the wrapping of the material into the cylindrical shape of filter body 101.

FIG. 4 is a sectional side view of the filter 410 incorporated into an end of a cannabis cigarette 400. Filter 410 may be, for example and without limitation, either filter 100 or filter 800. Thus, for example a smoking material 401 is circumscribed with a rolling paper 403 that overlaps some or all of a portion of outer wrap 103. When negative pressure is applied to first end 102 of filter 100, as by inhaling, the follows a flow path from smoking material 401, into filter body 101, and out through first end 102.

FIG. 5 is a sectional side view of a cone 500, which includes filter 410 attached to rolling paper 501, allowing a user to provide cannabis into the cone.

FIGS. 6 and 7 illustrate a cannabis smoking article that includes replaceable filter. FIG. 6 is a sectional side view of a tube 601 formed from a rigid material, including but not limited to metal, ceramic, glass, wood or hard plastic, metal and having an open end 602 adapted to accept a filter, and FIG. 7 is a sectional side view of a smoking article including the metal tube and filter 410 that is configured for insertion and removal into the open end, and which is shown

Filter Specifications

Cannabis smoke can produce a range of unpleasant physical effects that are largely associated with hot combustion products. These effects include coughing, throat and airway irritation, burning or scratchy sensations in the throat, and a perception of harsh or overly hot smoke during inhalation. Users may also experience an unpleasant mouthfeel characterized by bitterness, acrid flavors, or a coating sensation on the tongue.

As discussed subsequently, a range of filter were tested in an effort to identify filters that mitigate physical effects, while providing the desired psychoactive effects of cannabis. Another important feature is that the filter provides an acceptable pull experience—that is, the filter does not require excessive inhaling force. In general, the effectiveness of filter 100 in mitigating physical effects while providing desired psychoactive effects was found to vary, in part, according to the normalized pressure drop through the filter, the length of the filter, and the diameter of the filter.

A commonly used normalized pressure drop through a filter is the pressure drop along a 100 mm length of filter when provided with dry, conditioned air at a volumetric flow rate of 17.5 mL/s, in accordance with ISO 6565. In certain embodiments, filters were formed by cutting a filter rod to desired lengths. Specific filters rods discussed herein include: a first filter rod, denoted as PD 450, having a normalized pressure drop, as described above, of 450 mmH₂O; a second filter rod, denoted as PD 550, having a normalized pressure drop of 550 mmH₂O; and a third filter rod, denoted as PD 650, having a normalized pressure drop of 650 mmH₂O. Each of these filter rods are manufactured by McAirlaid's Vliesstoffe GmbH, Berlingerode, Germany.

The following are, for example and without limitation, filter specifications that meet the combination of requirements of acceptable pull and overall experience.

In certain embodiments, for example and without limitation, the combination of requirements of acceptable pull and overall experience are provided by a PD 450 filter having lengths of from 10 mm to 18 mm; by a PD 550 filter having lengths of from 8 mm to 15 mm, and a PD 650 filter having a length of from 8 mm to 10 mm.

In various embodiments, the filter rod has a diameter of 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, or 9 mm. In other embodiments, the filter rod has a diameter of from 5.5 mm to 6.5 mm, from 6.5 mm to 7.5 mm, or from 7.5 to 8.5 mm. In certain embodiments, the filter rod has a diameter of from 5.5 mm to 8.5 mm, or is larger than 9 mm.

In various embodiments, the filter rod has a length of 5 mm, 8 mm, 10 mm, 12.5 mm, 15 mm, 18 mm, or 20 mm. In other embodiments, the filter rod has a length that is less than 8 mm, less than 10 mm, less than 12.5 mm, less than 15 mm, less than 18 mm, or less than 20 mm. In certain other embodiments, the filter rod has a length of from 5 mm to 10 mm, from 10 mm to 20 mm, or from 5 mm to 20 mm.

In various embodiments, the pressure drop in the filter rod material is 250 mmH₂O, 300 mmH₂O, 350 mmH₂O, 400 mmH₂O, 450 mmH₂O, 500 mmH₂O, 550 mmH₂O, 600 mmH₂O, 650 mmH₂O, 700 mmH₂O, or 750 mmH₂O. In certain embodiments, the pressure drop in the filter rod material is greater than 250 mmH₂O, greater than 300 mmH₂O, greater than 350 mmH₂O, greater than 400 mmH₂O, greater than 450 mmH₂O, greater than 500 mmH₂O, or greater than 550 mmH₂O.

Examples

Tests were performed for a range of filters and lengths to determine the filter effectiveness. First, three 100 mm lengths of filter rods having a diameter of 7.6 mm were obtained from McAirlaid's Vliesstoffe GmbH, Berlingerode, Germany. The filter rods differ in their pressure drop with a 17.5 mL/s draw, where filter rod type 450PD had a pressure drop of 450 mmH₂O, filter rod type 550PD had a pressure drop of 550 mmH₂O, and filter rod type PD650 had a pressure drop of 650 mmH₂O. Each of these filter rod types were used to form filters 100 of six different lengths: 5 mm, 8 mm, 10 mm, 15 mm, 18 mm, and 22 mm, which were in turn assembled into cannabis cigarettes 400 having filter 100. Filter lengths shorter than 5 mm were not tested because such lengths did not provide sufficient structural integrity for repeatable assembly and handling during testing. This limitation reflects handling constraints during experimental assembly and does not preclude shorter filter lengths in commercial implementations incorporating additional structural support from an outer wrap or adjacent smoking material.

The test subjects were instructed to report on the following aspects of the smoking experience when comparing different filter configurations having varying pressure drops (PD) and filter lengths. The aspects evaluated by the test subjects included:

• • (a) Pull experience: the perceived ease or difficulty of drawing smoke through the filter;
  • (b) Throat irritation: whether any tingling, scratchiness, or irritation in the throat was experienced;
  • (c) Harshness: whether the smoke was perceived as smooth, intense, hot, or cool;
  • (d) Taste: whether the flavor of the cannabis was perceptible through the filter, whether any flavor was reduced relative to an unfiltered cigarette, and whether any additional mouthfeel characteristics, such as coating, bitterness, or acrid flavors, were present;
  • (e) Effect: whether any noticeable change in the perceived psychoactive effect of THC was observed; and
  • (f) Overall experience: an overall assessment of the smoking experience and any observations regarding use of the filter.

The results were, in general, as follows. Pull experience was generally reported as positive up to a threshold filter length, beyond which the pull became noticeable and was described as difficult. The threshold filter length was observed to be inversely related to the pressure drop of the filter media, such that higher pressure drop media exhibited shorter acceptable filter lengths than lower pressure drop media.

Throat irritation was not identified as a significant issue for the filter media described herein across most tested configurations. Harshness was identified as a primary evaluation metric and was observed to have an inverse relationship with pull experience for the tested filter media. As draw resistance increased, perceived harshness generally decreased. Filter configurations were therefore selected by balancing a tolerable pull experience against a noticeable reduction in harshness. Taste was evaluated because flavor is associated with the presence of terpenes and cannabinoids. A change in taste was treated as indicative of a potential reduction in these compounds. Accordingly, filter configurations were selected to limit taste changes to minimal or non-perceptible levels relative to unfiltered cigarettes. Effect was evaluated separately from taste by asking test subjects whether any change in perceived psychoactive effect was noticed. For the tested combinations of pressure drop and filter length, no noticeable change in effect was generally reported. In configurations exhibiting very high draw resistance, test subjects reported a more rapid or intense onset of effects, which was attributed to increased inhalation effort rather than changes in filtration behavior. Overall experience reflected a composite assessment of the foregoing factors and was most often determined through direct comparative preference testing between multiple filter configurations.

Subjective results from the smoking of each of the cannabis cigarettes were then tabulated in the following four Tables below, where:

Table 1 reports the relative difficulty of the pull through the cannabis cigarette in comparison to an unfiltered cigarette (“easy pull,” “noticeable pull,” or “difficult pull”). These results show that, in general, increasing filter rod length and increasing filter rod type pressure drop provide a more difficult pull, and are thus less suitable for inhalation of cannabis smoke.

Table 2 reports the harshness of the experience in comparison to an unfiltered cigarette (“harsh,” “noticeable improvement,” or “significant improvement”). These results show that, in general, increasing filter rod length and increasing filter rod type pressure drop provide an improvement in harshness, that is, reduced harshness.

Table 2 reports the harshness of the experience in comparison to an unfiltered cigarette (“harsh,” “noticeable improvement,” or “significant improvement”). These results show that, in general, increasing filter rod length and increasing filter rod type pressure drop provide an improvement in harshness, that is, reduced harshness.

Table 4 reports on the overall experience when compared to a rolled tip cannabis cigarette the overall experience when compared to a rolled tip cannabis cigarette (“poor” or good”). The overall experience when compared to a rolled tip cannabis cigarette taste and effectiveness show that, in general, there is a range of filter rod lengths for each filter rod type pressure drop that provides an experience consistent with that of a rolled tip cannabis cigarette.

TABLE 1
Relative pull difficulty relative to an unfiltered cigarette, where
“++” = easy pull, “+” = noticeable pull, and “−” = difficult pull.
	Filter Rod Length
	5 mm	8 mm	10 mm	15 mm	18 mm	22 mm
Filter	PD 450	++	++	++	++	+	−
Rod	PD 550	++	++	++	+	−	−
Type	PD 650	++	++	+	−	−	−

TABLE 2
Harshness of the experience in comparison to an unfiltered
cigarette, where “−” = harsh, “+” =
noticeable improvement, and “++” = significant improvement.
	Filter Rod Length
	5 mm	8 mm	10 mm	15 mm	18 mm	22 mm
Filter	PD 450	−	+	+	++	++	++
Rod	PD 550	−	+	+	++	++	++
Type	PD 650	+	+	++	++	++	++

TABLE 3
taste and effectiveness of the cannabis in comparison
to an unfiltered cigarette, where “0” =
no change, “+” = limited change, and “−” = unpleasant.
	Filter Rod Length
	5 mm	8 mm	10 mm	15 mm	18 mm	22 mm
Filter	PD 450	0	0	0	0	0	0
Rod	PD 550	0	0	0	0	+	−
Type	PD 650	0	0	0	+	−	−

TABLE 4
is the overall experience when compared to a rolled
tip cannabis cigarette, where “−” =
poor, and “+” = good.
	Filter Rod Length
	5 mm	8 mm	10 mm	15 mm	18 mm	22 mm
Filter	PD 450	−	−	+	+	+	+
Rod	PD 550	−	+	+	+	−	−
Type	PD 650	−	+	+	−	−	−

Combining the test results provides an indication of acceptable filter rods. With reference to Table 1, a requirement of an easy or noticeable pull limits the length of the PD 450 filter rod type to 18 mm or less, the length of the PD 550 filter rod type to be 15 mm or less, and the length of the PD 650 filter rod type to be 10 mm or less. With reference to Table 2, a requirement of improved (that is, reduced) harshness limits the length of the PD 450 filter rod type to be 8 mm or greater, the length of the PD 550 filter rod type to be 8 mm or greater, and the length of the PD 650 filter rod type to be 5 mm or greater. With reference to Table 3, a requirement of taste and effectiveness has no limit on the length of the PD 450 filter rod type, limits the length of the PD 550 filter rod type to be 18 mm or less, and the length of the PD 550 filter rod type to be 15 mm or less. With reference to Table 4, a requirement of having an overall experience in comparison to rolled tip cannabis cigarettes taste and effectiveness indicates a range of PD 450 filter rod type lengths to be 10 mm or greater, limits the length of the PD 550 filter rod type to be from 8 mm to 15 mm, and the length of the PD 650 filter rod type to be from 8 mm to 10 mm.

Thus, for example the combination of requirements of acceptable pull and overall experience indicates a range of PD 450 filter rod type lengths to be from 10 mm to 18 mm, a range of PD 550 filter rod type lengths to be from 8 mm to 15 mm, and the length of the PD 650 filter rod type to be from 8 mm to 10 mm.

The foregoing examples is provided for purposes of illustration and explanation and is not intended to limit the scope of the appended claims. The features, structures, and characteristics described herein in connection with one or more embodiments may be combined in any suitable manner in one or more alternative embodiments. In addition, although certain embodiments are described with reference to specific materials, dimensions, configurations, or performance characteristics, variations, substitutions, and modifications will be apparent to those of ordinary skill in the art and are intended to fall within the scope of the claims.

Examples of cannabis smoking articles or filters that can be used with the inventive filters include, but are not limited to, filters sold as part of a roll-your-own kit; filters in a pre-rolled cone; filters incorporated into a disposable pipe; filters incorporated into a spoon hand pipe; smoking pipes (including Sherlock pipes and tobacco-style pipes); water pipes/bongs; gravity bongs and gravity bong nozzles; one-hitter pipes; dry herb vaporizers; oil vaporizers; and concentrate vaporizers.

The terms “comprising,” “including,” and “having,” as used herein, are open-ended and do not exclude additional elements, steps, or features. Unless otherwise indicated, terms of degree or approximation, such as “about,” “substantially,” or “approximately,” are intended to encompass reasonable variations consistent with the disclosed embodiments. References to specific examples or embodiments are not intended to limit the claims to those examples or embodiments.

Similarly, it should be appreciated that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment of this invention.

Claims

1. A method of filtering combustion products from cannabis, comprising:

drawing smoke generated from combusted cannabis through a length of a filter disposed in a cannabis smoking article prior to inhalation,

wherein the filter comprises a cellulose-only fibrous web having a density and length selected to selectively reduce harsh combustion particulates while limiting absorption of cannabinoids during smoking, and

wherein a 100-millimeter length of the filter, when provided with a volumetric flow rate of 17.5 mL/s of dry, conditioned air, has a normalized pressure drop equal to or greater than about 450 mmH2O.

2. The method of claim 1, wherein the cellulose-only fibrous web is formed exclusively from natural cellulose fibers without chemical binders, resins, or synthetic adhesives.

3. The method of claim 1, wherein the filter has a length of less than about 20 millimeters.

4. The method of claim 1, wherein the filter has a length between about 8 millimeters and about 15 millimeters.

5. The method of claim 1, wherein the filter has a diameter between about 5.5 millimeters and about 9 millimeters.

6. The method of claim 1, wherein a 100-millimeter length of the filter, when provided with a volumetric flow rate of 17.5 mL/s of dry, conditioned air, has a normalized pressure drop of between about 450 mm H2O and about 650 mmH2O.

7. The method of claim 1, wherein the normalized pressure drop and length are selected such that a pressure drop across the filter during smoking remains within a draw resistance suitable for inhalation.

8. The method of claim 1, wherein the cannabis smoking article includes a portion to accept cannabis.

9. The method of claim 1, wherein the cannabis smoking article includes the cannabis.

10. The method of claim 1, wherein the filter is removably positioned within a flow path of the cannabis smoking article such that the filter is configured for removal and replacement without permanent attachment to the cannabis smoking article, said method further comprising:

providing the filter; and

placing the filter in the cannabis smoking article.

11. An article for a user to consume filtered cannabis smoke through an end of a mouthpiece, comprising:

a cannabis-accepting portion;

a path for air to flow from the portion to the mouthpiece; and

a filter,

where, when the cannabis-accepting portion includes cannabis, when smoke is generated from combusted cannabis, and when the user inhales through the mouthpiece, the smoke flows through a length of the filter,

wherein the filter comprises a cellulose-only fibrous web having a density and length selected to selectively reduce harsh combustion particulates while limiting absorption of cannabinoids during smoking, and

wherein a 100-millimeter length of the filter, when provided with a volumetric flow rate of 17.5 mL/s of dry, conditioned air, has a normalized pressure drop equal to or greater than about 450 mmH2O.

12. The article of claim 11, wherein the cellulose-only fibrous web is formed exclusively from natural cellulose fibers without chemical binders, resins, or synthetic adhesives.

13. The article of claim 11, wherein the length is less than about 20 millimeters.

14. The article of claim 11, wherein the length is between about 8 millimeters and about 15 millimeters of the filter.

15. The article of claim 11, wherein the filter has a diameter between about 5.5 millimeters and about 9 millimeters.

16. The article of claim 11, wherein a 100-millimeter length of the filter, when provided with a volumetric flow rate of 17.5 mL/s of dry, conditioned air, has a normalized pressure drop of between about 450 mm H2O and about 650 mmH2O.

17. The article of claim 11, wherein the normalized pressure drop and length are selected such that a pressure drop across the filter during smoking is suitable for inhalation.

18. The article of claim 11, wherein the cannabis-accepting portion is adapted to accept cannabis.

19. The article of claim 11, wherein the cannabis-accepting portion includes cannabis.

20. The article of claim 11, wherein the article is configured to removably receive the filter.

21. The article of claim 11, wherein the filter includes is a first portion comprising the cellulose-only fibrous web and a second portion comprising a material different from the cellulose-only fibrous web.

22. The article of claim 21, wherein the second portion is a rolled tip.

23. A filter comprising a first portion and a second portion circumscribed with an outer wrap and having a length, where the first portion comprises a cellulose-only fibrous web having a normalized pressure drop and a first length selected to selectively reduce harsh combustion particulates while limiting absorption of cannabinoids during smoking, where the second portion is a material different than a cellulose-only fibrous web and has a second length.

24. The filter of claim 23, wherein the cellulose-only fibrous web is formed exclusively from natural cellulose fibers without chemical binders, resins, or synthetic adhesives.

25. The filter of claim 23, wherein the second portion is a rolled tip.

26. The filter of claim 23, wherein a 100-millimeter length of the first portion, when provided with a volumetric flow rate of 17.5 mL/s of dry, conditioned air, has a normalized pressure drop equal to or greater than about 450 mmH2O.

27. The filter of claim 23, wherein a 100-millimeter length of the first portion, when provided with a volumetric flow rate of 17.5 mL/s of dry, conditioned air, has a normalized pressure drop of between about 450 mm H2O and about 650 mmH2O.

28. The filter of claim 23, wherein the first length is less than about 20 millimeters.

29. The filter of claim 23, wherein the first length is between about 8 millimeters and about 15 millimeters of the filter.

30. The filter of claim 23, wherein the filter has a diameter between about 5.5 millimeters and about 9 millimeters.

31. The filter of claim 23, where the length of the filter is between 18 mm to and 25 mm.