Secondhand Vape Exposure: Effects, Who's at Risk, and More Does cannabis create thirdhand smoke? Thirdhand Smoke Resource Center Have you heard of Third Hand Smoke , When most people think about the risks of smoking, they picture first or second hand smokethe smoke you inhale or breathe when someone lights up near you. But Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Researchers Warn of Potential Harm From E Cigarette Secondhand Vapor AZPM