News Is Second Hand Vape Smoke Harmful? 2nd Hand Vape Smoke Effects Does cannabis create thirdhand smoke? Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Is Second hand Vapour Harmful To Others? 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 Is Second Hand Vape Smoke Harmful Secondhand smoke and secondhand aerosol