My girlfriend started smoking and I hate it what should I do?

My girlfriend started smoking, and it's affecting our relationship. She got addicted after her friend pressured her to try it. I hate smoking and its smell, making it hard to kiss her. She gets defensive when I mention it, leading to fights. I love her deeply but I really hate smoking. I don’t know how to handle this situation.

My girlfriend started smoking and I hate it what should I do?
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