The Dangers of Secondhand & Thirdhand Smoke Exposure Juul study shows secondhand vaping emissions are less toxic than cigarette 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 E cigarettes contain hazardous substances, addictive and harmful 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