E Liquid Flavour Concentrates & DIY Vape Juice Supplies 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, Processed Food Flavoring Additive 'Diacetyl' also in Vape Chemical Free Life Mixing Vape Liquids Fume Miami Mix Salt 30mL Popcorn Lung: The Deadly Secret in Your Vape! Did you know that the sweet, tempting flavor in your e liquid could be hiding a chemical called Diacetyl? This chemical, which tastes