Vape Juice & E Liquid Ingredients List (4 Main Components) Banned Dangerous Vape Ingredients to Avoid in Your Vape Juice Vaping 101: Which Vape Juice Ingredients to Avoid What Are The Main Ingredients of Vape Juice? Vape Juice Ingredients: All You Need to Know 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.