How do I get my bf to stop smoking so much weed?

My boyfriends life pretty much revolves around weed. The second he wakes up he has to smoke, and he will still be smoking till he goes to bed. He even smokes at work, which he thankfully doesn’t get in trouble for. I smoke too, so I’m not against it at all. But it’s taking a toll on our relationship. He has no motivation to do anything and we never have extra money because he spends at least $100 a week on it. He doesn’t care that he drains all of our money, and I’ve tried talking to him about it but he just gets mad. What can I do to help him not smoke as much and see my view?