Big Vape' reporter talks lessons learned from Juul's rise, fall, and future The Examination Vaping is often marketed as a safer alternative to smoking, but many vape products contain nicotine, harmful chemicals, and heavy metals that can harm developing brains and lungs. Juul, the vape device teens are getting hooked on, explained Vox JUUL Pod Ingredients: What's in E Cigarettes? Are Juul Vapes Safe The Smoking Alternative, unlike any E Cigarette or Vape