Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center Study suggests switching from smoking to vaping indoors may reduce children's secondhand exposure to nicotine Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Researchers Warn of Potential Harm From E Cigarette Secondhand Vapor AZPM Dangers of vaping and second hand vaping are greatly underestimated Earth.com