Vapes are harmful and can be highly addictive. Some disposable vapes have nearly tripled in nicotine strength in the span of only 5 years. Exclusive Juul's mint flavored e cig sales skyrocketed after other flavors pulled New York Post Puff bars: a dangerous trend in adolescent : Current Opinion in Pediatrics Teens say they don't vape, they 'Juul.' That makes the activity hard to track Los Angeles Times