Dangerous Chemicals in Vapes You Should Know Propylene Glycol and Vegetable Glycerin 2 Pack: one PG and one VG, 500 mL (1.06 Pint) Each with Dispensing Caps; USP, Food Grade, Kosher: Amazon.com: Industrial & Scientific What Ingredients Are In An E Liquid? 3 Dangerous Chemicals Found in Vapes Explained The combination of propylene glycol and vegetable glycerin e cigarette aerosols induces airway inflammation and mucus hyperconcentration Scientific Reports 1 in 3 teens who vape say they get e cigarettes online, including through social media apps. (PMC study) Parents: Monitor online activity, start the conversation, and stay informed. Learn more at