Vaping: The Mechanics (infographic) Canada.ca Vapor Hiding Dangerous Ingredients: E Cigarette Concoctions Are Far from Safe American Lung Association Do you know what you're vaping? Propylene glycol (PG) and vegetable glycerin (VG) are the main liquids in vapes. When heated, these chemicals turn toxic and aren't safe to breathe. E Cigarettes & Vaping, Chemical Safety Chemical Insights Dangers of Vaping What's In Your Vape? Vaping Facts Vape Awareness Nimco The Danger of Chemicals Used in Vape Liquid The Science Blog