My guy buddy wants his girlfriend to stop smoking... and asks me for advice. Help.

LilRedHead
So my friend's girlfriend is an avid smoker, she smokes a couple packs a day and is quite addicted. She has no plans on quitting and no matter how much my buddy wants her to quit she refuses to. I totally understand why he wants her to quit for the health benefits but at the same time it's her choice to do it. Y'know? Anyways, I have no idea what to tell him and he goes to me for advice all the time. I tried looking at google and this site for previous answers to this question and I didn't find any surprisingly! So gag, what do you think? Don't even think about what I should say, what should he do?
My guy buddy wants his girlfriend to stop smoking... and asks me for advice. Help.
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