Is Second hand Vapour Harmful To Others? 2nd Hand Vape Smoke Effects Does cannabis create thirdhand smoke? When someone vapes around others they expose them to 'second hand aerosol'. But what happens to that aerosol then? Does it disappear or is it like cigarette smoke and stays around, sticking to Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Vapes are commonly used as a way to stop smoking but it could have a huge unexpected risk