I need several opinions.

My BF smokes weed. Nothing crazy, however I hate it. I have asthma so it affects me. He tries his best to keep it away. I just can’t deal with it. I’ve tried every type of compromise but just can’t do it. I love him to death but it’s stops me from being completely happy. I expressed this to him and he said I’m trying to change who he is.

Idk what to do.