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CIGARETTE SMOKING AND INFERTILITY IN MEN


 For this study of testosterone concentrations in 2 matched groups of men, 1 of lifelong nonsmokers and 1 of men smoking at least 30 cigarettes daily, 2 specimens of blood were collected with an interval of 7 days without smoking. The first specimens showed plasma testosterone to be higher in nonsmokers than in smokers, indicating that smoking decreases plasma testosterone. The difference in plasma testosterone between the 2 specimens from nonsmokers was insignificant, but in smokers the 2nd specimen showed a statistically significant increase in testosterone concentration. Reduced testosterone biosynthesis caused by carbon monoxide inhibition of Leydig cell microsomal hydroxylases seems to be the probable explanation of this effect. The possibility thus exists that cigarette smoking can contribute to infertility in men.
