My boyfriend likes to smoke too much weed

My boyfriend likes to smoke too much weed and while I do like to smoke too I feel like it’s just excessive. We are both 22 and I always tell him to keep his mind fresh and take breaks but at the same time I don’t want to feel like I’m nagging him because I smoke too. He’s still very productive in my opinion but the level of smoking is just unnecessary like at any time of day mornings, afternoon, nights (with me) like why? I feel like his friends might be a bad influence on him because when it’s just us it’s not as excessive (we’re long distance so i can’t really control that) I don’t know how else to address this at this point so really what else can I do? What else could I do?

Ps we don’t live together (long distance) but we see each other like every two weeks and I know he’s smoking because every time we’re on the phone he says he’s about to smoke or just did.