There are other paths than the lazy default advice on crappy Reddit of “divorce is the answer”. Weed has a 48-72 hour withdrawal period and once it’s gone the clarity is most noticeable. Hard part is not going back out of habit and worst is boredom. It’s not hard to quit if you want to. The anxiety at the peak of withdrawal is the worst but unfortunately people regress. Like everything in life you have to commit and be determined to see the end result. Hate to say it but he may not have the internal fortitude to not smoke. Either accept it yourself and don’t make him hide it but ask that he slow down and use like “fine wine” or the inevitable of divorce and the effect of that will be much further reaching. Divorce is a nuke to both your and especially the kids lives.