Researchers Warn of Potential Harm From E Cigarette Secondhand Vapor AZPM Vaping vs. Smoking: Is One Really Safer Than the Other? 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 Juul study shows secondhand vaping emissions are less toxic than cigarette smoke