Do Juul Pods Have Diacetyl The Promise of Vaping and the Rise of Juul DYK? Vaping coats lungs with potentially harmful chemicals. This can include chemicals such as: Diacetyl: This food additive, used to deepen e cigarette flavors, is known to damage small passageways in the lungs. Potential Juul ban will boost other vaping brands, retailers and customers say Iowa Capital Dispatch JUUL electronic cigarette products linked to cellular damage UCR News UC Riverside