Does Vape Juice Expire? How to Tell, Shelf Life, & Storage What is Vape Juice? Ingredients, Flavoring & More ZampleBox Zamplebox 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. 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. What is in JNR Vapes? Ingredients & Safety Facts JNR Vape Store Vape E Liquid (Juice): Ingredients Explained FreeStyle Vapes