Nicotine, propylene glycol, sweet flavorings, and various toxic chemicals like carcinogens and heavy metals are found in vape juice, posing health risks, especially to youth. Propylene Glycol (PG) 250ml Creme de Vape 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. Propylene Glycol E Liquid Flavour Concentrates UK PG vs. VG: What's the Difference? Banned Dangerous Vape Ingredients to Avoid in Your Vape Juice