Source:"The Health Consequences of Smoking—50 Years of Progress. A Report of the Surgeon General." U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health. 2014. Report.
Source:"The Role of the Media in Promoting and Reducing Tobacco Use. Tobacco Control Monograph No. 19." U.S. Department of Health and Human Services, National Institutes of Health, National Cancer Institute. Bethesda, MD. June 2008.