I'll weigh in here, too. I've been an on/off smoker for decades. Fortunately, more "off" than on, and I knew I needed to quit at least a month before surgery, so I did; cold turkey. The issue, as I learned it, was not just the vasoconstriction, which I thought was related to nicotine, but also because nicotine retards bone growth/repair.
I have remained quit, except for 3 cigs one night, and a cigar on two separate occasions, including this last Friday night. And I felt it the next day on each occasion.
I also experience seasonal depression, and often go on Wellbutrin (Bupropion) for the winter. I'm at that precipice right now, and may well start it again this week. I wish I could say I'd exercise each day, and that would probably produce the dopamines I need to avoid depression. Anyway, I bring this up because Chantix, which is rx'd for quitting smoking, and is basically Bupropion, may be a good thing to discuss with your mother's doctor. It will make it easier to avoid smoking; this I say by experience.
Good luck with your mom. I should also say that in post-op recovery, I awoke to a nurse saying loudly in my ear, "how much do you smoke?". She had had trouble getting my blood O2 levels much over 90, which she says only happens with smokers. That one rattled me, as I hadn't smoked in over a month. I may be too late to undo decades of lung pollution, but at least I can stop and not further hasten my demise. Now, if I could just get everyone to always be real nice to me all the time, I'd never get that trigger to smoke again, right?
