While the word vapor is used to describe what e-cigarettes produce, and vaping is a term used to
describe the process of inhaling from an e-cigarette, the emissions out of the mouthpiece are not
actually a vapor, which is a gas, but rather they are primarily an aerosol. This aerosol consists of
submicron particles of the condensed vapor of glycols containing the nicotine and flavorants. So
users are not vaping, but rather they are aerosolizing.
In this paper we examine both the direct exposure to users as well as the indirect (passive)
exposure to non-users and compare the exposures to relevant health exposure guidelines