Abstract: A method of producing a liquid tobacco extract is provided, including: preparing a tobacco starting material including natural tobacco material; heating the tobacco starting material in a non-sealed extraction chamber at an extraction temperature of between 125° C. and 160° C. for between 90 minutes and 270 minutes to release gaseous volatile compounds from the tobacco starting material, the tobacco starting material not being in a liquid suspension during the heating step, a flow of inert gas being passed through the tobacco starting material during the heating in the extraction chamber, and the inert gas carrying the gaseous volatile compounds released from the tobacco starting material during heating away from the chamber; collecting the volatile compounds released and carried away from the tobacco starting material by the inert gas flow during the heating; and forming a liquid tobacco extract including the collected volatile compounds.

Abstract: A method of producing a liquid tobacco extract, the method including the steps of: preparing a tobacco material; applying an alkaline solution to the tobacco material to produce an alkalised tobacco material; heating the alkalised tobacco material at an extraction temperature of between 100 degrees Celsius and 160 degrees Celsius for at least 30 minutes, the alkalised tobacco material being heated in a flow of inert gas or in a flow of a combination of an inert gas with water or steam, and a water content of the alkalised tobacco material, prior to the heating step, being between 10 percent by weight and 20 percent by weight; condensing volatile compounds released from the alkalised tobacco material during the heating step and collecting condensate of the volatile compounds; and forming a liquid tobacco extract comprising the condensate of the volatile compounds.

Abstract: A nicotine composition is provided, including a non-aqueous solvent; at least 0.2 percent by weight of nicotine based on the weight of the nicotine composition; a first ratio by weight of (?-ionone+?-damascenone) to (phenol) of greater than 0.25; and a second ratio by weight of (furaneol+(2,3-diethyl-5-methylpyrazine)*100)) to (nicotine) of greater than 5×10?4. A cartridge including the nicotine composition, and a method of preparing the nicotine composition, are also provided.

Abstract: A method of producing a liquid tobacco extract is provided, the method including the steps of: preparing a tobacco starting material including natural tobacco material such that during the step of preparing the tobacco starting material, the tobacco is not subjected to any treatment adapted to alter the pH of the tobacco; heating the tobacco starting material in a flow of inert gas at an extraction temperature of between 125 degrees Celsius and 160 degrees Celsius for between 90 minutes and 270 minutes; collecting volatile compounds released from the natural tobacco starting material during the heating step; and forming a liquid tobacco extract comprising the collected volatile compounds.

Abstract: A method of manufacturing a concentrated tobacco extract for an aerosol-generating article is provided, including: providing a natural tobacco material; heating the material to a temperature and for a time such that volatile species including nicotine are released from the material, the heating includes heating the material in a flow of inert gas or in a flow of a combination of an inert gas with water or steam or heating the material under vacuum; collecting the released volatile species and forming a liquid, naturally derived tobacco extract including the collected species, a polyhydric alcohol, and at least about 40 percent by weight of water; and heating the liquid extract to evaporate at least some of the water and obtain concentrated tobacco extract, by heating to a temperature and for a time such that a water content in the naturally derived tobacco extract is reduced by at least about 60 percent.

Abstract: A liquid tobacco extract is provided, including: a non-aqueous solvent; at least 0.2 percent by weight of nicotine based on a weight of the liquid tobacco extract; and a ratio by weight of (?-ionone+?-damascenone) to (phenol) of greater than 0.25.

Abstract: A method of producing a blended liquid tobacco extract, including: preparing a first tobacco starting material having a first reducing sugar content and a first nicotine content; preparing a second tobacco starting material having a second reducing sugar content and a second nicotine content, the first and the second starting materials being different from each other and have not been subjected to a prior extraction; heating the first tobacco starting material at a first extraction temperature; heating the second tobacco starting material at a second extraction temperature lower than the first extraction temperature; collecting volatile compounds released from the first and the second starting materials during heating; and combining the collected volatile compounds released from the first and the second starting materials and forming the blended liquid tobacco extract from the combined volatile compounds.

Abstract: A smoking article is provided, including a combustible heat source having opposed front and rear faces; one or more airflow channels extending from the front face to the rear face of the combustible heat source; an aerosol-forming substrate downstream of the rear face of the combustible heat source; and a thermostatic bimetal valve located between the rear face of the combustible heat source and the aerosol-forming substrate, wherein the thermostatic bimetal valve is arranged to deform from a first position, in which the valve substantially prevents or inhibits fluid communication between the one or more airflow channels and the aerosol-forming substrate, to a second position, in which the one or more airflow channels and the aerosol-forming substrate are in fluid communication, when the thermostatic bimetal valve is heated to above a threshold temperature.