Real-Time Assessment of E-Cigarettes and Conventional Cigarettes Emissions: Aerosol Size Distributions, Mass and Number Concentrations
Department of Pharmacy, Laboratory of Molecular Biology & Immunology, University of Patras, 265 04 Rio-Patras, Greece
Institute of Chemical Engineering Sciences, ICE-HT, 265 04 Patras, Greece
Institute for Research and Innovation NOSMOKE.TEAM, Patras Science Park SA, Stadiou Str., 265 04 Rio-Patras, Greece
Authors to whom correspondence should be addressed.
The authors contributed equally to this work.
Now at: Laboratoire Chimie, Environnement, Aix-Marseille Université, CNRS, LCE, 13331 Marseille, France.
Toxics 2019, 7(3), 45; https://doi.org/10.3390/toxics7030045
Received: 18 July 2019 / Revised: 24 August 2019 / Accepted: 26 August 2019 / Published: 30 August 2019
(This article belongs to the Special Issue Current Knowledge of E-cigarettes and Heated Tobacco Products)
Cigarette smoke is a complex mixture of chemical compounds which are emitted during the processes of tobacco combustion. Electronic cigarettes (e-cigs) are expected to produce less harmful compounds due to the absence of tobacco leaf combustion. However, potential risks of the passive exposure to the aerosol exhaled by e-cig users have been raised in the last decade. In this study, the aerosols with diameter less than 1 μm (PM1) produced by vaping of various e-cig liquids were compared to those generated by smoking conventional cigarettes in real time. The mass and number concentration along with the number size distribution were measured in a closed room of 35 m3 volume. Our results showed that aerosols emitted from e-cig liquids had a different profile compared to those from conventional cigarettes. Although e-cigs initially produced higher particle mass and number concentrations, their emissions had much shorter lifetime of approximately 10–20 s, in comparison with the conventional and hand-rolling cigarette particulate emissions which had a dissipation time of approximately 1.4 h in a 35 m3 room. E-cigs emitted aerosols which volatilized rapidly, as they probably consisted almost only of propylene glycol and/or vegetable glycerin.