Is Second Hand Vapor from E Cigarettes Dangerous? [Infographic] The Local Brand In secondhand vape, scientists smell risk American Heart Association 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 Vape mouthpieces could be swarming with fungi that harm airways New Scientist Second hand vape smoke linked to more asthma symptoms in kids