Second hand Vape Vs Secondhand Smoke Project Filter Secondhand Vape Vaping poses lower secondhand risk than Secondhand Smoke and Electronic Cigarette Aerosols US EPA Vaping Produces Far Less Second Hand Nicotine Than Smoking Respiratory Therapy Second Hand Vaping: Minimal Impact Compared to Smoking Scientists Warn Against Breathing in Secondhand Vape 'Smoke' Newsweek Secondhand Electronic Cigarette Aerosol and Indoor Air Quality US EPA