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, Do Crystal Bar Vapes Have Diacetyl? Vapor Shop Direct Which brands contain diacetyl in their vape juices? Knowledge Kaiweili Digital Technology , The notion that vaping causes "popcorn lungs" due to diacetyl in e liquids is based on outdated information. , ., While diacetyl was once used as a flavoring agent in some e liquids and linked to