page_title: British Doctors Study
hierarchical_section_title: British Doctors Study
context_page_description: The British Doctors' Study was a prospective cohort study which ran from 1951 to 2001, and in 1956 provided convincing statistical proof that tobacco smoking increased the risk of lung cancer.
context_section_description: The British Doctors' Study was a prospective cohort study which ran from 1951 to 2001, and in 1956 provided convincing statistical proof that tobacco smoking increased the risk of lung cancer.
caption: Survival from age 35 of non-smokers, cigarette smokers and ex-smokers who stopped smoking between 25 and 34 years old.[1]