"About 33 percent of chronic users will have low sperm counts. Binding of the active components and metabolites of marijuana to receptors on sperm themselves has also been shown to lead to decreasing motility rates. What is less clear are the effects of more occasional users—no good studies have been done but the prevailing thought is that while these men will have rapid recovery to their sperm function with briefer cessation in use, they should avoid use when trying to get pregnant as well."
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"So the theory was that if a man was exposed to testosterone and because of that reason, he had lost sperm, then you would expect that within three to six months, you will have normal spermatogenesis again. You'll have normal sperm. The fact of the matter is that there's a number of men for whom it may take a few years to go back to a normal sperm count."