Vapes Ingredients 4 ingredients ng VAPE JUICE para matapos na..for PUBLIC information. FYI. I'm sick and tired of hearing the words "We dont know what chemicals ang nasa vape" or "UNKNOWN CHEMICALS" Vape Flavors and Vape Juice: What You Need to Know Johns Hopkins Medicine 8 Vape Juice Ingredients to Avoid Toxic e Liquid Flavors 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.