What's In Fake Juul Pods? 4 Signs Your Juul Pod Is Fake Do Juul Pods Have Diacetyl Study: Juul Pods Contain Caffeine. What's It Doing There, And What Cell specific toxicity of short term JUUL aerosol exposure to human bronchial epithelial cells and murine macrophages exposed at the airliquid interface Respiratory Research Springer Nature Link E cigarette flavored pods induce inflammation, epithelial barrier dysfunction, and DNA damage in lung epithelial cells and monocytes Scientific Reports