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, 10 Things to Know About Diacetyl in E Juice Diacetyl Vape Is Diacetyl in Vape Juice 2021 ? Research indicates that certain flavoring chemicals used in e cigarettes can irritate lung tissue and trigger inflammatory responses in laboratory settings. Some compounds, such as diacetyl, have been linked to respiratory damage when