| Title |
Characterisation of the spatial and temporal dispersion differences between exhaled e-cigarette mist and cigarette smoke / |
| Authors |
Martuzevicius, Dainius ; Prasauskas, Tadas ; Setyan, Ari ; O’Connell, Grant ; Cahours, Xavier ; Julien, Rémi ; Colard, Stéphane |
| DOI |
10.1093/ntr/nty121 |
| Full Text |
|
| Is Part of |
Nicotine & Tobacco Research.. Oxford : Oxford University Press. 2019, vol. 21, iss. 10, p. 1371-1377.. ISSN 1462-2203. eISSN 1469-994X |
| Keywords [eng] |
e-cigarette mist ; cigarette smoke ; spatial and temporal dispersion |
| Abstract [eng] |
There are fundamental differences between 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 upon 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 electronic 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: 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. |
| Published |
Oxford : Oxford University Press |
| Type |
Journal article |
| Language |
English |
| Publication date |
2019 |
| CC license |
|
