Tar Yields of Cigarettes and Male Lung Cancer Risk2

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Abstract
Of 252 male lung cancer patients, 248 or 98% were cigarette smokers, significantly (P<.001 ) more than in the control group (526=64% of 839). In relation to the relative risks (RR) of never-smokers, the adjusted (for age, total years smoked, and average number of cigarettes smoked per day) lung cancer RR for smokers who had exclusively smoked cigarettes belonging to group II (15–24 mg tar/cigarette) was 10.4 (P<.001); for smokers who had exclusively smoked cigarettes belonging to group III (>24 mg tar/cigarette), it was 25.1 (P<.001). The respective RR of smokers who had mainly smoked cigarettes belonging to group I (P<.001), 20.6 (P<.001), and 36.7 (P<.001). After the differences in daily consumption were taken into account, the adjusted (for age and total years smoked) lung cancer RR for smokers who had consumed mainly cigarettes belonging to the various groups were the following: group II (11–20 cigarettes/day) compared to group III (11–20 cigarettes/day), RR=0.6 (P<.05); group II (>20 cigarettes/day) compared to group III (>20 cigarettes/day), RR=0.8; group II (>20 cigarettes/day) compared to group III (11–20 cigarettes/day), RR=1.3 (P<.001); group II (>20 cigarettes/day) compared to group III (P<.001); and group II (11–20 cigarettes/day) compared to group III (P<.001).

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