1. U.S. Department of Health Education and Welfare. Smoking and health. Report of the Advisory Committee to the Surgeon General. Washington, DC: U.S. Government Printing Office; 1964. DHEW Publication No. [PHS] 1103.
2. US Department of Health Education and Welfare. The health consequences of smoking. A report of the Surgeon General. Atlanta, GA: U.S. Government Printing Office; 1972.
3. U.S. Department of Health and Human Services. The health consequences of smoking. A report of the surgeon general. Atlanta, GA: 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; 2004.
4. Causal Inference in Public Health
5. U.S. Department of Health and Human Services. The health consequences of smoking–50 years of progress. Atlanta, GA: U.S. Department of Health and Human Services; 2014.