Since you love her very much, you can try to understand why she smokes. Then you can work together to give up her.
This can also increase your memory. Don't dislike her.
If she can really quit smoking, she may deepen her feelings for you by quitting smoking.
In fact, female college students smoke a lot now. Really, there are no kinds. Don't think that girls who smoke are like this. It's unfair to them. Since you love her, help her quit ~ I wish you success!