Teens say they don't vape, they 'Juul.' That makes the activity hard to track Los Angeles Times The Rise and Fall of Juul Respiratory Therapy What is JUUL? St. This vaping device, called a JUUL, might look like a USB drive, but it contains nicotine and other harmful chemicals. Alarmingly, this easily hidden device and its enticing vapor flavors, like Vape, Juul, e cigarettes and the FDA: Everything you need to know A new twist on vaping: Juuls are small, discreet, and have health and school officials concerned