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The accumulated evidence on lung cancer and environmental tobacco smoke

^a Department of Environmental and Preventive Medicine, Wolfson Institute of Preventive Medicine, St Bartholomew’s and Royal London School of Medicine and Dentistry, London EC1M 6BQ

Correspondence to: Professor Wald njwald@mds.qmw.ac.uk

Objective: To estimate the risk of lung cancer in lifelong non-smokers exposed to environmental tobacco smoke.
Design: Analysis of 37 published epidemiological studies of the risk of lung cancer (4626 cases) in non-smokers who did and did not live with a smoker. The risk estimate was compared with that from linear extrapolation of the risk in smokers using seven studies of biochemical markers of tobacco smoke intake.
Main outcome measure: Relative risk of lung cancer in lifelong non-smokers according to whether the spouse currently smoked or had never smoked.
Results: The excess risk of lung cancer was 24% (95% confidence interval 13% to 36%) in non-smokers who lived with a smoker (P<0.001). Adjustment for the effects of bias (positive and negative) and dietary confounding had little overall effect; the adjusted excess risk was 26% (7% to 47%). The dose-response relation of the risk of lung cancer with both the number of cigarettes smoked by the spouse and the duration of exposure was significant. The excess risk derived by linear extrapolation from that in smokers was 19%, similar to the direct estimate of 26%.
Conclusion: The epidemiological and biochemical evidence on exposure to environmental tobacco smoke, with the supporting evidence of tobacco specific carcinogens in the blood and urine of non-smokers exposed to environmental tobacco smoke, provides compelling confirmation that breathing other people’s tobacco smoke is a cause of lung cancer.

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