I never viewed this issue under the headline
"feminization of lungs".
For me it was/is still an appeal to see a woman smoke a cigarette with a male image. If a woman smokes e.g. a "Cowboy-Killer" she does it to get that image of beeing a tough and strong girl in today's society. She shows that she can handle the potent smoke which was originally dedicated to men's lungs. And while she receive the smoke she feminizes it 'cause she's able to hold it in her female lungs, too. She will get nothinmg else for me than smoker's lung only of a female gender.
Otherwise I must say that everything written in the other responses is logic and a good point of view I'm going to think about.