That lung scan visual hits hard, but the real takeaway is simple: vaping is not harmless water vapor. Chemicals found in some e cigarettes, including diacetyl, have been tied to serious lung damage, Do Juul Pods Have Diacetyl The Promise of Vaping and the Rise of Juul Resource Center Breathe PA Diacetyl: The Hidden Chemical That Changed Vaping and Food Safety Forever SMOKO E Cigarettes Vapes with Diacetyl List: Brands and Flavors to Avoid