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Survival from age 35 of non-smokers, cigarette smokers and ex-smokers who stopped smoking between 25 and 34 years old^[1]

Survival from age 40 of non-smokers, cigarette smokers and ex-smokers who stopped smoking between 35 and 44 years old^[1]

Survival from age 50 of non-smokers, cigarette smokers and ex-smokers who stopped smoking between 45 and 54 years old^[1]

Survival from age 60 of non-smokers, cigarette smokers and ex-smokers who stopped smoking between 55 and 64 years old^[1]

The British Doctors' Study was a prospective cohort study which ran from 1951 to 2001, and in 1956 provided convincing statistical evidence that tobacco smoking increases risk of lung cancer.^[2]

^ ^a ^b ^c ^d Cite error: The named reference Doll2004 was invoked but never defined (see the help page).
^ Doll, R.; Hill, A. B. (1956-11-10). "Lung cancer and other causes of death in relation to smoking; a second report on the mortality of British doctors". British Medical Journal. 2 (5001): 1071–1081. doi:10.1136/bmj.2.5001.1071. ISSN 0007-1447. PMC 2035864. PMID 13364389.