Disposable E Cigarettes More Toxic Than Traditional Cigarettes UC Davis New age and flavor rules on smoking and vaping could help reduce both Teens say they don't vape, they 'Juul.' That makes the activity hard to track Los Angeles Times Vapes are harmful and can be highly addictive. Some disposable vapes have nearly tripled in nicotine strength in the span of only 5 years. JUUL Side Effects: What Are the Health Risks?