Vaping and ecigarettes Vapor Hiding Dangerous Ingredients: E Cigarette Concoctions Are Far from Safe American Lung Association E Cigarettes, Vapes, and other Electronic Nicotine Delivery Systems (ENDS) FDA The Impact of E Cigarettes on the Lung Providers AmeriHealth Caritas Pennsylvania TIL propylene glycol, the chemical in e cig vapor, is used in asthma inhalers and has had decades of research done on its safety. (sourced study in link) : r todayilearned Propylene Glycol (PG) 100ml Creme de Vape