About E Cigarettes (Vapes) Smoking and Tobacco Use CDC Secondhand exposure from vaping marijuana: Concentrations, emissions, and exposures determined using both research grade and low cost monitors ScienceDirect 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 Children at risk: Emory study uncovers the hidden dangers of secondhand vape exposure