What Are the Ingredients of Vape Juice? Does Vape Juice Expire? How to Tell, Shelf Life, & Storage 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. This is what you're actually inhaling when you vape. (Hint: It's not water vapor.) Vape Juice Ingredients: All You Need to Know What Actually Goes Into E Liquid? Breaking Down the Ingredients Vapeology