When someone vapes around others they expose them to 'second hand aerosol'. But what happens to that aerosol then? Does it disappear or is it like cigarette smoke and stays around, sticking to Tobacco Smoke, Vaping, and Asthma AAFA.org Is passive vaping a hidden risk to the public? Here's what the experts know so far ABC News Secondhand exposure from vaping marijuana: Concentrations, emissions, and exposures determined using both research grade and low cost monitors ScienceDirect About E Cigarettes (Vapes) Smoking and Tobacco Use CDC