What Ingredients Are in E Liquids? Skyline Vape Shop Skyline Smoke Company 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. Don't let the stylish designs and sweet flavors fool you; vaping can significantly increase your risk for serious respiratory and cardiovascular diseases, including: Chronic obstructive pulmonary disease Heart attacks and 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.