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The study authors, which included Professor Allan Hackshaw of the Cancer Research UK and UCL Cancer Trials Centre at University College London, estimated the relative risks of smoking one, five, or twenty cigarettes (an entire pack) a day

Bradford Hill, whose paper is published in the opening pages of this issue, have carried out a meticulously conducted inquiry, the results of which have very serious implications, for they conclude that smoking is a factor, and an important factor, in the production of carcinoma of the lung The practical question which the doctor in practice has to answer is whether any of his patients-for instance, those with smokers cough-should be advised to give up smokingThere is no evidence about the degree of risk which cigarette smokers take, but it does apparently increase in direct proportion to the amount smoked daily and to the total duration of the habit. PRIMARY PULMONARY MALIGNANCY Treatment by Total Pneumonectomy