What's Actually in Your Vape: A Complete Chemical Breakdown 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. Vape juice contains a long list of chemicals, many of which aren't even listed on the packaging. Testing has also shown that vapes labelled "nicotine free" can have high nicotine levels. What Are the Ingredients in Vape Juice? Understanding E Cigarette Liquids: Key Ingredients Explained Vibe Medina