What Does Vaping Do to Your Lungs? Johns Hopkins Medicine Nicotine Poisoning: What It Is, Symptoms, Causes & Treatment 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. Vaping Products That Look Like Juice Boxes and Candy Are Target of Crackdown The New York Times Why Do Disposable Vapes Make You Feel Sick? Causes and Solutions How to Choose A Vape Juice Flavour Beginner's Guide