Only if she's worried about her own health through passive smoking and/or completely disgusted by it will she back off. Otherwise, it has no positive or negative effect. It is what it is.
I personally quit smoking. It started off as a social thing, but when I realized I didn't need it to pick up at all, I quit before I managed to get addicted.
And if you're thinking that the advantage of smoking are the smoking areas - you'd be surprised as to how nobody cares if you walk in there with or without a cigarette. You just walk in and talk to anybody you want and they won't even acknowledge it. And if they do, you tell them the truth . . . The dance floor is too loud and you need a break.
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Some girls think if you smoke you're more cool and bad boy.
Yeah, if she has the immature mind of a 15 year old who just discovered cigarettes, alcohol and sex.