1. The Health Consequences of Smoking-50 Years of Progress: A Report of the Surgeon General,2014
2. United States Food and Drug Administration (FDA). Family Smoking Prevention and Tobacco Control Act 2009 [Available from: http://www.fda.gov/TobaccoProducts/GuidanceComplianceRegulatoryInformation/ucm237092.htm.
3. United States Food and Drug Administration (FDA). Healthy Innovation, Safer Families: FDA's 2018 Strategic Policy Roadmap 2018 [Available from: https://www.fda.gov/downloads/AboutFDA/ReportsManualsForms/Reports/UCM592001.pdf.
4. National Academies of Science. Public Health Consequences of e-cigarettes. Washington DC; 2018.
5. Factors Associated With Electronic Cigarette Users' Device Preferences and Transition From First Generation to Advanced Generation Devices;Yingst;Nicotine Tob Res,2015