Second Hand Vaping: Minimal Impact Compared to Smoking Secondhand vape plumes could form lung damaging radicals American Chemical Society Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Secondhand Smoke Second hand E cigarette Vapour Increases Risk Of Poor Respiratory Health Study Finds Cigarette Smoke Detector Secondhand Smoke and Electronic Cigarette Aerosol Resources US EPA Don't Be Fooled, E cig Aerosol Is Not Harmless for Kids American Lung Association