I worried and I don't want my girlfriend to smoke weed
But it's her life? Is there a specific reason?
I just don't.
I understand the intention behind that statement. Just realize you can suggest things to others, but they won't always listen.
I'll drop the subject.
Alright, it's okay if you don't want to discuss it. But if it ever comes up again next time, I'm sure your girlfriend would be happy that you care about her health like that! But it's up to her, and you can only try to persuade her but it's good to try.