Your girlfriend is smoking 3.5 packs a day because she knows it will please you. She also likes to show you her sacrifice with the flem and cough. I don't have a problem with your relationship. I think smoking, as a highly visual body function, is very useful for projecting both power and subserviance. She could very well stop smoking if you two parted ways over other issues. On the whole I am pleased, and she feels the same way, that she is smoking and has found a way to preserve your relationship. NIce move.