Opposite attract sometimes. Most likely you can't change the girl and if she seems really into her religion and non-smokers then if you really like her you'll have to change your ways and sacrifice to quit smoking. I know it's hard but personally girls dig guys who are sober because most guys I have been with forget a lot and usually end up dropping out and have no future. I know I am a stoner myself but I would stop for someone if I knew they loved me. I do have a future I want to go to college. So smoking has not taken over my life. It doesn't have to take over yours. If you must you should tell her "look, I smoke but I can quit for you if we ever decide to have a relationship because that is how much I care about your feelings." just some tips. sorry i hope i helped.