Abstract: A cigarette making machine is provided with a pressure drop measuring unit (1) located at or close to the garniture of the making machine. The pressure drop of a gas stream of constant volume is introduced into the compacted tobacco rod beneath the format finger (2) on the making machine at a point at which that pressure drop measurement correlates with the bound pressure drop of the finished cigarette. The unbound cigarette pressure drop or draw resistance experienced by the smoker can be calculated using the bound tobacco rod pressure drop obtained by correlation with the measured pressure drop across the rod in an algorithim processed by calculation means. The degree of ventilation of the cigarette may also be utilised in the algorithim calculation. Comparator means allows the unbound cigarette pressure drop to be maintained within pre-set limits by varying cigarette parameters which affect the overall unbound cigarette pressure drop.

Abstract: Low sidestream cigarettes having cigarette rods comprising paper wrappers including compounds of a type which effect a sidestream reduction of at least 30% when used on rods not exceeding 20 mm in circumference.

Abstract: A cigarette having a wrapper comprising one to fifty percent by weight of calcium sulphate and/or calcium tartrate exhibits reduced sidestream smoke delivery and increased puff number.

Abstract: Low sidestream cigarettes comprise cigarette rods not exceeding 20 mm in circumference. The cigarette rods comprise paper wrappers of a type which effect a sidestream reduction of at least 30% when used on rods of conventional dimensions.

Abstract: Smoking articles in the form of a smoking material rod enclosed with a filter means by a paper wrapper are described wherein the density of the smoking material is in a range of from about 100 mg cm.sup.-3 to about 260 mg cm.sup.-3. The smoking material contains at least 20% by weight of expanded tobacco while the filter means has a filtration efficiency less than about 45% for removal of particulate matter. Ventilation means is operable to provide a ventilation level of at least 30%. Smoking articles in accordance with the disclosure exhibit acceptable mainstream smoke over the whole of the smoking process, i.e., there is less perception of an increase in mainstream smoke temperature.

Abstract: Smoking article rod is made by extruding a tobacco/binder mixture, with the addition of water, to provide a rod form extrudate, under conditions such that the extrudate is of a cross-section greater than that of the die orifice. The extrudate is drawn down by, for example, passing the extrudate about two driven and peripherally grooved draw down drums.

Abstract: Low sidestream cigarettes comprise at least 20% expanded tobacco and a cigarette paper comprising a burn retardant.

Abstract: Low sidestream cigarettes comprise cigarette rods not exceeding 20 mm in circumference. The cigarette rods comprise paper wrappers of a type which effect a sidestream reduction of at least 30% when used on rods of conventional dimensions.

Abstract: Low sidestream cigarettes comprise at least 20% expanded tobacco and cigarette paper of an air permeability of not more than 20 Coresta units, the tobacco density being between 100 and 260 mg cm.sup.-3.