Is Second Hand Vape as Dangerous as Secondhand Smoke? Vapesourcing Secondhand smoke and secondhand aerosol Thirdhand Smoke Resource Center Protecting Californians Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center Debunking 7 Myths About Secondhand Smoke Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN