Not good: Limited data last i checked, but consensus is that it is likely harmful. How harmful is variable and obviously depends on usage. Studies on tobacco and fertility are sketchy but suggest around 15% reduction per conception cycle. It's not a good idea (for a lot of reasons) for women or men when trying to conceive.
Answered 4/5/2014
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Generally not but...: If this were a common problem there would be far fewer babies born here in the santa cruz, ca area :) however, there is evidence that heavy marijuana use may lower sperm count somewhat and reduce the ability of sperm to fertilize eggs, but no evidence it causes "infertility" per se. But for couples experiencing fertility issues it would be wise to reduce or stop marijuana use. See comment:.
Answered 11/28/2017
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