Do Crystal Bar Vapes Have Diacetyl? Vapor Shop Direct Vaping, Diacetyl, and Popcorn Lung: Is the Threat Real? Vaping360 The wall of flavor. We keep the shelves fully stocked with Crossbar, Loon, and all your other favorites so you never have to settle for a flavor you don't want. Janesville, Did you know some flavored vapes contain diacetyl, a chemical linked to popcorn lunga rare, irreversible lung disease? It scars the small airways, making it hard to breathe. Symptoms can mimic