1. Tobacco or Health: a Global Status Report;World Health Organization (WHO),1997
2. Mortality in relation to smoking: 50 years’ observations on male British doctors;Doll;BMJ,2004
3. US Department of Health and Human Services (2004) The Health Consequences of Amoking: A Report of the Surgeon General, US 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
4. Cigarette smoking and infection;Arcavi;Arch. Intern. Med.,2004
5. US Department of Health and Human Services (1990) The Health Benefits of Smoking Cessation [DHHS Publication No. (CDC) 90-8516], US Department of Health and Human Services, Public Health Service, Centers for Disease Control, Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health