Honestly i don't know him but i believe that when he becomes a father he will quit. I was a toker for a long time, and we all know when it's time to quit. Either when we get too depressed, familyissues or for someone else.

You're not gonna like me for saying this and I may catch greef from others here, but you are pulling a "Bait and switch". You have accepted and loved him as he is and are now saying he must change. He is the same as he was when ya'll got together. It isn't easy to quit. I didn't quit when I had kids but I didn't promise I would. The only stong arguement you can use is that you have decided you are not going to stay in this relationship with a smoker and that it has taken you this much time to realize what you thought you knew in the beginning. If he then quits because he wants to to save ya'lls relationship then great. But don't go another moment letting him beleive that he is OK. My wife just assumed that I would grow out of it. We have argued in the past years and she now has threatened to leave me after 26 years of marrage. So I quit. Don't do that to him. Weather you beleive weed is bad or not so bad or whatever. Don't lead him on thinking you will change him later because that is unfair.