A member asked:

Can smoking marijuana affect a males sperm count or fertility?

4 doctors weighed in across 2 answers
Dr. Khurram Rehman answered

Specializes in Fertility Medicine

Yes: In men it can lower testosterone hormone levels and can reduce sperm counts and quality - lower motility (swimming ability) and possibly less ability for the sperm to fertilize an egg. Heavy use is probably worse than occasional use, so it's best for him to quit if possible, or cut down if unable to quit.

Answered 12/10/2013

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Yes: It lower sperm count so affects fertility when smoking for years lower testosterone level.

Answered 3/26/2013

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