Understanding Vape Juice Ingredients in the UK: What's in Your Vape? Cue Vapor What's in an e liquid or vape juice? The main ingredients are propylene glycol (PG) and vegetable glycerine (VG). These are solvents that are basically used to dissolve and carry the other ingredients. Ingredients You Should Avoid Using In Your Vape Juice The Beer Connoisseur Vape Juice Vape Dojo Vape Juice Ingredients Guide Freeman Vape