Is Secondhand Vape Smoke Harmful Secondhand Vape Exposure: Effects, Who's At Risk, And More Australia Is Second Hand Vaping Dangerous It's important to protect children from cigarette smoke, and it's just as important to do the same with vaping. Secondhand vape smoke aerosol isn't harmless It contains tiny particles that can Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Secondhand smoke and secondhand aerosol 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