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. E liquid composition Vaping Post What Actually Goes Into E Liquid? Breaking Down the Ingredients Vapeology What Ingredients Are In An E Liquid? This is what you're actually inhaling when you vape. (Hint: It's not water vapor.)