Vapour evaporates within seconds
Meanwhile, a 2018 peer-reviewed study, had shown that exhaled e-vapour product particles are actually liquid droplets that evaporate within seconds. In line with what previous air samples had indicated, these findings had suggested that vaping probably has a minimal impact on indoor air quality.
The study titled “Characterisation of the Spatial and Temporal Dispersion Differences between Exhaled e-cigarette mist and Cigarette Smoke,” was published in the renowned journal Nicotine & Tobacco Research and carried out via a collaboration between Kaunas University of Technology in Lithuania, EMPA (Swiss Federal Laboratories for Materials Science and Technology), ETH Zurich (Swiss Federal Institute of Technology) and Fontem Ventures.
In order to measure particle concentrations in the air, study participants were asked to use e-cigarettes or smoke conventional cigarettes at different distances from a heated mannequin, representing a bystander, and under different room ventilation conditions. In the meantime, the researchers measured aerosol particle concentrations and size distributions at the mannequin’s position.
Particles from cigarette smoke linger significantly longer
For both e-cigarettes and regular cigarettes, the particle concentrations registered following each puff were in the same order of magnitude. However, for vaping products the particle concentration returned to background values within a few seconds, whilst for cigarettes it increased with successive puffs, only returning to background levels after 30-45 minutes.