What's in vape smoke Ads of the World Part of The Clio Network Chemical Concerns: Which Vapes Contain Diacetyl? They may seem sweet and tasty, but each time you vape, you breathe in harmful chemicals. One of these chemicals is diacetyl, used in popcorn flavourings for its buttery taste. When eaten, Vapes can contain harmful chemicals, such as diacetyl and heavy metals. They just don't put it on the pack. Do you know what you're vaping? Get the facts at nt.gov.au vaping Cancer Council Chemicals in e cigarettes may put users at risk