Today's nico teen addicts: What role does 'juuling' play? Vox takes a look at what's fueling the popularity of Juul e cigarettes among kids. One reason: It delivers a powerful hit of nicotine. According to one young user, After about a week, Easily Refill Your Juul Pods! How to Refill a Juul Pod Tutorial Study: Juul Pods Contain Caffeine. What's It Doing There, And What Does It Do? FDA Strikes Again Flavored Vape Pods Are Banned, JUUL Gets Hit Hard