I think it depends on how long you have been smoking it. And how old you are... and if you already have a low sperm count anyway. If a man has a low sperm count to begin with, I would advise him to not smoke pot if he wants to have a baby. Studies do show that smoking pot can reduce sperm count in a man. If a man has been smoking pot most of his life, he will probably end up with a low sperm count (lower than the average man) Pot does effect your body. It effects your brain, which in turn effects everything else in your body. Just thought I would put my two cents in...