The British Medical Journal (1950) reports a significant increase in lung cancer deaths in England and Wales over the past 25 years, far exceeding population growth. This increase is not due to improved diagnosis but is likely real. The study by Richard Doll and A. Bradford Hill examines the link between smoking and lung cancer. They found that smokers are more likely to have lung cancer than non-smokers. Among 649 lung cancer patients, 0.3% were non-smokers, compared to 4.2% in the control group. Among smokers, a higher proportion of lung cancer patients smoked heavily. Cigarette smoking was more closely associated with lung cancer than pipe smoking. Inhaling was not significantly linked to lung cancer. The study also found that lung cancer patients started smoking earlier and smoked longer than controls, but the differences were small. The results suggest that smoking is an important factor in the development of lung cancer. The study concludes that smoking is a major cause of lung cancer, and further research is needed to confirm this.The British Medical Journal (1950) reports a significant increase in lung cancer deaths in England and Wales over the past 25 years, far exceeding population growth. This increase is not due to improved diagnosis but is likely real. The study by Richard Doll and A. Bradford Hill examines the link between smoking and lung cancer. They found that smokers are more likely to have lung cancer than non-smokers. Among 649 lung cancer patients, 0.3% were non-smokers, compared to 4.2% in the control group. Among smokers, a higher proportion of lung cancer patients smoked heavily. Cigarette smoking was more closely associated with lung cancer than pipe smoking. Inhaling was not significantly linked to lung cancer. The study also found that lung cancer patients started smoking earlier and smoked longer than controls, but the differences were small. The results suggest that smoking is an important factor in the development of lung cancer. The study concludes that smoking is a major cause of lung cancer, and further research is needed to confirm this.