Update: Demographic, Product, and Substance Use Characteristics of Hospitalized Patients in a Nationwide Outbreak of E cigarette, or Vaping, Product UseAssociated Lung Injuries United States, December 2019 MMWR Adolescents who use e cigarettes are more likely to use conventional cigarettes The Impact of E Cigarettes and Asthma: What You Need to Know Factsheets Tobacco Prevention Toolkit Stanford Medicine A systematic review on risk factors and reasons for e cigarette use in adolescents Highlighting Specific Features to Reduce Chemical and Thermal Risks of Electronic Cigarette Use through a Technical Classification of Devices