Hubby smokes, has anyone else gone through this?

Okay I have a question, my husband and I have been trying to conceive for a couple months now but nothing is happening I get my period regularly every month at the same time so I don't think it's me but my husband smokes marijuana for bipolar & anxiety and he smokes everyday twice a day and I really want him to cut it out completely but every time he tries he never sticks to it I'm not sure if that's the biggest reason why nothing has happend yet he drinks beer only but every once I awhile he eats healthy and doesn't smoke cigarettes or anything :( has anyone else gone through something like this ?