E Liquid Ingredients] What Is Vape Juice Made Of? Grey Haze UK Harmful Chemicals in Vapes and E Liquids You Should Avoid SMOKO E Cigarettes What Is Vape Juice Made Of? Understanding the Ingredients Inside 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. High Levels of Fruit flavored Chemicals in E cigarette Liquids 8 Vape Juice Ingredients to Avoid Toxic e Liquid Flavors