Is Second Hand Vapour Harmful? Facts for Bystanders 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 What You Need To Know About Vaping Sleeping baby safety tip: Keep baby's environment smoke and vape free. Secondhand smoke in areas where a baby sleeps or spends time, like home or the car, increases the risk of health problems. Is Second Hand Vape Smoke Dangerous? RxLeaf