Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Secondhand Smoke vs Vape: What the Science Says Do Vapes Have Second Hand Smoke We protect kids from cigarette smokelet's do the same First hand smoke comes from all combustible tobacco products. This includes Cigarettes, Cigars, Pipes, Hookah, and VAPES. This is the primary source of nicotine addiction. No amount of Second hand smoke is safe and Second hand e cigarette vapour increases risk of poor respiratory health, study finds Nursing in Practice Juul study shows secondhand vaping emissions are less toxic than cigarette smoke