Prevent Cancer Foundation urges FDA to move quickly on review of Juul products How are Juul eCigs Different from Other eCigarettes and Vapes? The Dangers of JUUL: What Families Need to Know 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