Torque 56 50ml E liquid by Halo A Dark Tobacco Shortfill to dilute A&L Diethylene Glycol Monoethyl Ether Lab Grade, 500ml 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. Formaldehyde is used to preserve dead bodies. This same cancer causing chemical is also found in vape juices. Vaping may look harmless, but looks can be deceiving. Glycol Analysis using a GC Capillary Column