Document zbp53gkjXQ7y8bkkKK9gbKzb0

'H ig Cancel* Controls ;al Total 518 3 1 0 2 5 8 4 3 ing smoked cigarettes;! 94 (76 per cent) of the! similar history. No suchj icy of tobacco usage iij pipe, cigar, chew, and among the lung cancel^ compared with the com fact, 68 of the controjj icco in a form other thah sively; whereas only 15| incer patients did so cles which are not mucEj tudy Reported by Total 518 34 19 15 484 329 155 Controls j lTotal 518 | 124 -I 56 j 68 i i394 24 J 154 ]t LUNG CANCER VOL. 44 175 Xal>*e 4__ Amount of Cigarette Smoking During 20 Years Prior to Study Reported by Lung Cancer Patients and Controls Package? of Cigarettes Smoked per Day Total Cases Number Per cent 518 100 34 7 19 4 71 14 304 59 80 15 10 2 Controls Number Per cent 518 100 124 24 50 10 105 20 199 38 22 4 18 3 ISifferent for the nonusers of tobacco in L> <M?*,.two seri*es. M%his suggestion of an effect by cigcettes only is consistent with other in stigations in the field. Some support |<Si the hypothesis that cigarette smokaffects the development of epithelial jcinoma of the lung more than adeScarcinoma may be noted. Six out *46 (13 per cent) of the cases of denocarcinoma did not smoke cigjettes; whereas only 28 out of 472 M per cent) of the patients with other pies of carcinoma, described variously ib squamous, epithelial, undifferen|ted, did not smoke cigarettes. pJne commonly used measure of the mount of exposure to cigarette smok- tb. ing, the average number of packs smoked per day, appears in Table 4. Seventy-four per cent of all lung cancer patients reported smoking one or more packs of cigarettes on the average per day over the preceding 20 years, com pared with a frequency of only 42 per cent among the controls. "Excessive cigarette smoking" (two or more packs per day) occurred almost four times as commonly among the case series as among the control group. Other items which may indicate the amount of cigarette smoking include the age at which the individual began smoking, whether or not he smokes be fore breakfast, and whether or not he "inhales." Table 5 reveals that, by all -Ago of Beginning Cigarette Smoking, Smoking Habits, and "Cigarette Cough" Reported by Lung Cancer Patients and Controls JSSlgarette Smoking Characteristics umber Cases Per cent Based on Cigarette Smokers Only Per cent Based on Total Number Controls Per cent Based on Cigarette Smokers Only jpl cigarette smokers 518 484 100 100 518 93 394 100 Began 15 years of age 166 34 32 116 29 Began 15-24 286 59 55 243 62 legan 25 years of age Kale" 32 449 7 93 6 35 87 327 9 83 j>0ke before breakfast" 373 77 ' 72 229 58 garettc cough" 204 42 39 112 28 Per cent Based on Total 100 76 22 47 7 63 44 22