dope and sperm count

What kind of effect would smoking dope every day have on one’s sperm count or sperm mobility? If there is an effect (I’m guessing there would be), would it be permanent or would it change once the dope is out of one’s system?

You’re going to have to be a bit more specific, since the term “dope” variously refers to marijuana, heroin or any of several other drugs.

sorry, I’m a drug innocent - I mean marijuana