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3. U.S. Department of Health and Human ServicesThe Health Consequences of Smoking--50 Years of Progress: A Report of the Surgeon General20142016-04-08AtlantaU.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 Healthhttp://www.surgeongeneral.gov/library/reports/50-years-of-progress/
4. 21st-Century Hazards of Smoking and Benefits of Cessation in the United States