Am I overreacting?

My boyfriend of 4 years is addicted to smoking weed and I’m so over it. I’ve smoked with him socially in the past if we were kid-free for the weekend or out on a night out without the kids. He wants to smoke ALL DAY, EVERY DAY. As soon as he wakes up in the morning, before he eats, before he goes to work, before he goes to bed... just before we do anything! He turns into a zombie and I worry about the safety of our kids when he’s with them just because he’s so slow to react. Is this abnormal? Is there anything I can do?? I’ve tried talking with him but he doesn’t see it as a problem! Am I overreacting? Any and all advice is welcome!