Abstract
STATISTICAL studies have shown a fairly definite association between cigarette smoking and carcinoma of the bronchial tree,1 2 3 4 5 6 7 8 9 10 11 as well as other effects on the body.12 , 13 Some do not accept this association as one of cause and effect. Apparently there are other possible explanations. The validity of the methods of gathering the statistics involved has also come into question.14 Hoping to add some useful points of information on the dosage of smoke intake and the disposition of smoke in the respiratory tract, I undertook the studies reported in this and subsequent articles.Tar is a prominent ingredient of smoke,‡ and it . . .
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