Aerosol-generating system providing preferential evaporation of nicotine

Abstract

An aerosol-generating device comprising:a heater assembly comprising at least one heating element; an aerosol-forming substrate proximate to the heater assembly, the aerosol-forming substrate comprising a liquid mixture comprising nicotine and a first aerosol- former, the first aerosol-former having a boiling temperature higher than nicotine;a power supply for supplying power to the heater assembly to generate an aerosol from the aerosol- forming substrate;a mouthpiece on which a user puffs to draw aerosol out of the aerosol- generating device; and control circuitry configured to control the supply of power to the heater assembly, wherein the control circuitry is configured to supply a first power to at least one heating element of the heater assembly, or to supply a power sufficient to maintain at least one heating element of the heater assembly at a first temperature or within a first temperature range, between user puffs, and configured to supply a second power to at least one heating element of the heater assembly,the second power being higher than the first power, or being sufficient to raise the temperature of at least one heating element of the heater assembly above the first temperature or first temperature range, during user puffs, to preferentially vaporise nicotine over the first aerosol former.Advantageously, the aerosol-forming substrate is heated by the heating element both during puffs and between user puffs. By heating the aerosol-forming substrate between user puffs, preferential evaporation of nicotine is promoted.

Description

technical field [0001] The present invention relates to aerosol-generating systems, and in particular to aerosol-generating systems that generate nicotine-containing aerosols by heating an aerosol-forming substrate. Background technique [0002] One type of heated aerosol generating system that generates an aerosol containing nicotine is an electronic cigarette. E-cigarettes typically heat a liquid containing nicotine and an aerosol-forming agent to create an aerosol. [0003] Nicotine-containing liquids for consumer use in aerosol-generating devices such as e-cigarettes typically contain relatively low concentrations of nicotine. High concentrations of nicotine can irritate the skin and can be harmful if ingested. The nicotine concentration of the liquid is regulated in some jurisdictions, eg not greater than 20 mg / ml. [0004] However, in order for users who have previously smoked conventional cigarettes to be satisfied with e-cigarettes, e-cigarettes must deliver a com...

AI Technical Summary

Problems solved by technology

However, this significantly increases the complexity and cost of e-cigarettes

and it is difficult to obtain consistent nicotine delivery with this type of system

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