Which brands contain diacetyl in their vape juice? Knowledge Kaiweili Digital Technology Do Crystal Bar Vapes Have Diacetyl? Vapor Shop Direct 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 Vapes are clouded in misconception . They contain many of the same toxic and cancer causing chemicals found in regular cigarettes. One of these ingredients is diacetyl, used in popcorn flavourings for its