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. 2022 Jun 22;7(26):22111–22124. doi: 10.1021/acsomega.2c01527

Table 1. Some Definitions and Descriptions of Smoke and Aerosols with Respect to Conventional Cigarettes and HTPs.

definition/description affiliation
an aerosol is suspension of particles in air or gas; the particles can be composed of only liquids or a mixture of liquids and solids2 tobacco industry (accessed 1 March 2022)
cigarette smoke aerosol is a complex and dynamic mixture of gases, liquid droplets, and solid particles suspended in air; generated by combustion, pyrolysis, and pyrosynthesis processes that overlap with low temperature distillation and sublimation processes4 tobacco industry (published 2020)
IQOS aerosol contains low levels of low molecular weight gases (such as CO, CO2 and NH3), aldehydes, ketones, low molecular weight hydrocarbons, and aromatics formed from drying, evaporation, and thermochemical decomposition (torrefaction/low temperature pyrolysis) of tobacco4,30 tobacco industry (published 2020,4 accessed 1 March 202230)
combustible cigarette smoke consists of an aerosol containing liquid droplets (particulate phase) suspended in a carrier gas and surrounded by its own gas vapor phase8 tobacco industry (published 2016)
an aerosol is a suspension of solid or liquid particles in a gas, usually air31 tobacco industry (accessed 17 November 2020)
smoke is an aerosol that contains solid particles and thousands of chemicals that are generated at high temperatures when a material combusts31 tobacco industry (accessed 17 November 2020)
smoke released by IQOS was described to contain elements from pyrolysis and thermogenic degradation that are the same harmful constituents of conventional tobacco cigarette29 independent study (published 2017)
it has been estimated that approximately 83% of combustible cigarette smoke is in a gaseous form that is not visible35 independent study (published 2013)
emissions from early generation heated tobacco product (Eclipse) were classed as smoke39 tobacco industry (published 2004)