Format

Send to

Choose Destination
Nicotine Tob Res. 2018 Jun 19. doi: 10.1093/ntr/nty121. [Epub ahead of print]

Characterisation of the Spatial and Temporal Dispersion Differences between Exhaled e-cigarette mist and Cigarette Smoke.

Author information

1
Kaunas University of Technology, Department of Environmental Technology, Kaunas, Lithuania.
2
Empa (Swiss Federal Laboratories for Materials Science and Technology), Laboratory for Advanced Analytical Technologies, Dübendorf, Switzerland.
3
ETH Zürich, Institute of Environmental Engineering, Zürich, Switzerland.
4
Fontem Ventures B.V., HN Amsterdam, The Netherlands.
5
SEITA-Imperial Brands, Fleury-les-Aubrais, France.

Abstract

Introduction:

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.

PMID:
29924352
DOI:
10.1093/ntr/nty121

Supplemental Content

Full text links

Icon for Silverchair Information Systems
Loading ...
Support Center