See: Schripp T, Markewitz D, Uhde E, Salthammer T. Does
e-cigarette consumption cause passive vaping? Indoor Air 2012.
DOI: 10.1111/j.1600-0668.2012.00792.x. In the study, human
subjects either smoked a cigarette or used (vaped) an electronic
cigarette in an experimental chamber. Concentrations of a number
of volatile organic compounds were measured using gas
chromatography/mass spectrometry. Based on the chamber emissions
study, 20 volatile organic compounds were identified in tobacco
smoke. Of these, 6 were detected in the electronic cigarette
vapor. The concentrations of these six compounds in electronic
cigarette vapor ranged from 2.5% (for acetaldehyde) to 39.1%
(for acetone) of the concentration in the tobacco smoke. The
exhaled air from vapers was also tested for these compounds. The
only compounds detected were small amounts of nicotine and
flavorings, moderate levels of glycerin, and high levels of
propylene glycol. The Rest of the Story This study confirms that
electronic cigarette use greatly reduc