3 Dangerous Chemicals Found in Vapes Explained Propylene Glycol Bulk Propylene Glycol Supplier LNW Player Two SALT Vapergate Salt Nicotine Giant Vapes 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 The Chemistry of Vaping ChemistryViews 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.