Best Disposable Vapes Without Propylene Glycol Oral Treatment Gallon Propylene Glycol Vape Side Effects Vapes or e cigarettes contain toxic chemicals like propylene glycol a common additive in food. The chemical is also used to make things like antifreeze, paint solvent, and artificial smoke in fog 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. Juul vs. FDA, What's the buzz about? The Chatterbox