A new study has confirmed what many suspected, establishing vaping is likely to cause lung and oral cancer. #9News Juul & a Vaping Crisis for Teens Morningside Center for Teaching Social Responsibility Do you know what's in a vape? JUUL The Smoking Alternative, unlike any E Cigarette or Vape Juul devices cited in seizure reports that started FDA probe Los Angeles Times Vaping releases toxic chemicals, including heavy metals, as well as ultrafine particles that go deep into the lungs. These increase the risk of heart and lung disorders.