Editing British Doctors Study (section)

{{Short description|Study (1951 to 2001) into smoking  and lung cancer}}
{{Multiple issues|
{{More citations needed|date=August 2019}}
{{Primary sources|date=August 2019}}
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[[File:British doctors study 35.svg|thumb|upright=1.4|Survival from age 35 of non-smokers, cigarette smokers and ex-smokers who stopped smoking between 25 and 34 years old<ref name="Doll2004" />]]
[[File:British doctors study 40.svg|thumb|upright=1.4|Survival from age 40 of non-smokers, cigarette smokers and ex-smokers who stopped smoking between 35 and 44 years old<ref name="Doll2004" />]]
[[File:British doctors study 50.svg|thumb|upright=1.4|Survival from age 50 of non-smokers, cigarette smokers and ex-smokers who stopped smoking between 45 and 54 years old<ref name="Doll2004" />]]
[[File:British doctors study 60.svg|thumb|upright=1.4|Survival from age 60 of non-smokers, cigarette smokers and ex-smokers who stopped smoking between 55 and 64 years old<ref name="Doll2004" />]]
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]].<ref>{{Cite journal |last=Doll |first=R. |last2=Hill |first2=A. B. |date=1956-11-10 |title=Lung cancer and other causes of death in relation to smoking; a second report on the mortality of British doctors |url=https://pubmed.ncbi.nlm.nih.gov/13364389 |journal=British Medical Journal |volume=2 |issue=5001 |pages=1071–1081 |doi=10.1136/bmj.2.5001.1071 |issn=0007-1447 |pmc=2035864 |pmid=13364389}}</ref>