My girlfriend won't kiss me because I chew tobacco, and wants to break up with me if I don't quit?

I've been chewing Copenhagen for the last few months or so now. I kind of kept it a secret from my girlfriend because her Grandma had emphysema from constant smoking, so she has never really liked tobacco things. Recently though she found a can of Copenhagen that I forgot about in the back pocket of a pair of my Wranglers. She asked me how long I'd been keeping this from her, and I told her a few months. She was really hurt I never told her. Now she is telling me I need to quit, or "we will have to seriously reconsider our relationship", and that I should chew gum instead. She is now refusing to kiss me too, which I think is a little extreme on her part. Just because I dip, don't mean I got a disease or something, I don't get why she don't want to kiss me. She is all over-reacting that I'm going to get gum or jaw cancer or something. It's hard for me to just quit, even though I'm 23, I am really addicted to it, so it's not that easy for me to quit. I really don't want to quit honestly, but I also don't wanna lose my girlfriend. Y'all got any advice or suggestions?
My girlfriend won't kiss me because I chew tobacco, and wants to break up with me if I don't quit?
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