My boyfriend is a stoner?

My boyfriend and I have been dating for 2 years. When the relationship gets longer, we stop getting swayed by butterflies and such and we start to think about our future. My boyfriend is addicted to weed, he is dependant on it and says he finds it hard to sleep without it but certain nights he can go to sleep without it too. I can tell that his health is starting to get affected too, he is getting thinner by the day. And whenever I think about our future, I have no hope. I really love him but I am hurt because of what he is doing. I don't want to make him choose between me and weed but I wish he would at least limit the consumption. Can anyone give me an advice on how I could improve my boyfriend's health? I haven't actually talked to him about it instead I would just ask him to not smoke on a certain night and to slowly limit his smoking. But I don't think it's helping. I would just cry with the thought of us maybe having no future. But I love him and even if I were to leave him, I at least want to help him improve his health as possible as I can. Any advice?
My boyfriend is a stoner?
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