Thirdhand Smoke Resource Center Protecting Californians Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN E Cigs and Second Hand Vaping: Dangers and Protections Secondhand vape plumes could form lung damaging radicals American Chemical Society Secondhand Vape Exposure: Effects, Who's at Risk, and More