How does marijuana negatively affect a man's fertility?
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Robert Brannigan, M.D. Professor, Urology
Oncofertility Consortium
Feinberg School of Medicine, Northwestern University
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Marijuana is a recreational drug that we see some patients who use, and patients should be made aware of the fact that even small amounts of marijuana can negatively affect hormone levels, specifically testosterone, and also negatively affect sperm production and function. So any use of marijuana should be stopped.