What's in your vape? Don't be fooled by the flavorsinside are harmful chemicals like propylene glycol, benzoic acid, nicotine, and glycerol that can damage your lungs, irritate your body, and keep you HOW TO TALK TO YOUR KIDS ABOUT VAPING The Safety Concerns of Cannabinoid Vaping Products 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.