Juul study shows secondhand vaping emissions are less toxic than cigarette smoke Is Second Hand Vape as Dangerous as Secondhand Smoke? Vapesourcing Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center Secondhand Vape Exposure: Effects, Who's at Risk, and More Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN