What Is Vaping? What's Actually in Your Vape: A Complete Chemical Breakdown 8 Vape Juice Ingredients to Avoid Toxic e Liquid Flavors What Is Nicotine & How It Benefits People? [A highly ignored subject] 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. DYK? Vaping coats lungs with potentially harmful chemicals. This can include chemicals such as: Diacetyl: This food additive, used to deepen e cigarette flavors, is known to damage small passageways in the lungs.