Teens say they don't vape, they 'Juul.' That makes the activity hard to track Los Angeles Times Vape to Cigarette Conversion: How Many Cigarettes Equal Your Vape Hits Velvet Cloud Pod e cigarettes less harmful than regular cigarettes, new study finds Brown University From Pods to Mods: All the Types of Vape Devices Explained Adolescents' Use of Pod Mod E Cigarettes Urgent Concerns New England Journal of Medicine