Provide a brief description about what the study adds (50-100 words). Several factors potentially influencing particle behaviour after exhalation of e-cigarette aerosols or emitted during smoking conventional cigarettes were studied; Differences in particle size between those exhaled following use of e-cigarettes and those emitted during smoking of conventional cigarettes were observed; E-cigarette particle concentrations decreased rapidly following exhalation due to evaporation; The removal of particles following smoking conventional cigarettes was much slower and was dependent upon the room ventilation rate.

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SUMMARYThe burning of a cigarette is a series of consecutive sequences of both passive and active burnings when a smoking cycle is applied to the cigarette. A previous study, using a smoking machine, showed that cigarette nicotine yields are dependent linearly on the difference between the time of smouldering (passive burning) and the time of smoking (active burning). It is predicted that the smoker's nicotine yield increases when the intensity of smoking increases, i.e., when the time to smoke a cigarette (smoking time) decreases. Note that observations made on machines might not be comparable to human behaviours. The aim of this study was to determine whether nicotine mouth-level exposure could be predicted through measurement of human smoking time. A smoking behaviour study was conducted to compare human smoking nicotine yields obtained from both filter tip analysis and the cigarette burning time model. Results showed that smokers' exposure to the smoke depends essentially on the speed at which the cigarette is smoked. An increase in human smoking intensity, resulting in a decrease in smoking time, generates an increase in smoke exposure, whatever the puff number, puff duration, puff volume and filter ventilation (open or blocked). The association of a machine smoking yield with a corresponding smoking time, and the time taken by a consumer to smoke the cigarette would provide information on the exposure to smoke constituents in a simple and effective manner. [Beitr. Tabakforsch. Int. 27 (2017)