Nicotine formula used by e cigarette maker Juul is nearly identical to the flavor and addictive profile of Marlboro cigarettes : r science Study: Juul Pods Contain Caffeine. What's It Doing There, And What Does It Do? Juul & a Vaping Crisis for Teens Morningside Center for Teaching Social Responsibility F.D.A. Approves Juul Vapes After Yearslong Delay The New York Times Vapes Designed for Adult Smokers Juul Labs UK