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 The Issues of Testing for Secondhand Smoke. Indoor Science Vaping harms your health Cancer Institute NSW How secondhand smoke, thirdhand smoke & vaping affects kids Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Tobacco Smoke, Vaping, and Asthma AAFA.org