Study: Juul Pods Contain Caffeine. What's It Doing There, And What Does It Do? New strong evidence that Juul is more toxic to lungs and hearts than earlier e cigs Stanton Glantz blog Juul ad study finds company targeted youth from beginning Vox Juul disregarded early evidence it was hooking teens Because tobacco companies aren't required to tell us what's in vapes, we wind up being lab rats for their dangerous, addictive products. So, let's be clear (since Big Tobacco won't be) JUUL Pod Ingredients: What's in E Cigarettes?