Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Effects Of Second Hand Vape Smoke Secondhand Smoke and Electronic Cigarette Aerosol Resources FACT: Most e cigarette users also smoke cigarettes, a pattern known as dual use. This means the tobacco industry isn't helping people quit; it's sustaining addiction through another product. While the industry claims E Cigarette vapor: Is it more harmful than second hand smoke?