Characterization of the Spatial and Temporal Dispersion Differences Between Exhaled E-Cigarette Mist and Cigarette Smoke
| Autor: | Tadas Prasauskas, Dainius Martuzevicius, Xavier Cahours, Ari Setyan, Grant O’Connell, Rémi Julien, Stéphane Colard |
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| Přispěvatelé: | Oxford University Press |
| Rok vydání: | 2018 |
| Předmět: |
Original Investigations
e-cigarette mist 01 natural sciences Cigarette Smoking law.invention 03 medical and health sciences spatial and temporal dispersion 0302 clinical medicine law Humans 030212 general & internal medicine Particle Size 0101 mathematics Aerosols Smoke Vaping cigarette smoke 010102 general mathematics Public Health Environmental and Occupational Health Mist Exhalation Environmental Exposure Aerosol Environmental chemistry Ventilation (architecture) Environmental science Particle Tobacco Smoke Pollution Particle size Dispersion (chemistry) |
| Zdroj: | Nicotine & Tobacco Research Nicotine & tobacco research, 21 (10) |
| ISSN: | 1469-994X 1462-2203 |
| Popis: | Introduction There are fundamental differences between electronic cigarettes (e-cigarettes) and conventional cigarette product categories with regards to potential environmental exposures, notably that e-cigarettes do not contain tobacco or generate side-stream emissions. Here we assess the spatial and temporal patterns of exhaled e-cigarette aerosol at a bystander’s position, and compare it with conventional cigarette smoke emissions. Methods Smokers were asked to use e-cigarettes or smoke conventional cigarettes in a room-simulating chamber. Volunteers used the products at different distances from a heated mannequin, representing a bystander, and under different room ventilation rates. Aerosol particle concentrations and size distributions at the bystander’s position were measured. Results For both product categories, the particle concentrations registered following each puff were in the same order of magnitude. However, for e-cigarettes the particle concentration returned rapidly to background values within seconds; for conventional cigarettes it increased with successive puffs, returning to background levels after 30–45 minutes. Unlike for the e-cigarette devices tested, such temporal variation was dependent on the room ventilation rate. Particle size measurements showed that exhaled e-cigarette particles were smaller than those emitted during smoking conventional cigarettes and evaporated almost immediately after exhalation, thus affecting the removal of particles through evaporation rather than displacement by ventilation. Conclusions Significant differences between emissions from the tested e- and conventional cigarettes are reported. Exhaled e-cigarette particles are liquid droplets evaporating rapidly; conventional cigarette smoke particles are far more stable and linger. Implications • Several factors potentially influencing particle behavior 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 on the room ventilation rate. Nicotine & tobacco research, 21 (10) ISSN:1462-2203 ISSN:1469-994X |
| Databáze: | OpenAIRE |
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