it is great and your friend is a wise one........I also see effect of smoking of my patients in the OR whether they are losing a limb due to decreased circulation or the way they wake up and we have worry more about their airway.......heres a little story about me, I had a tonsillectomy in 2009 (I was a smoker then) woke up from anesthesia still in the OR room and had 5 laryngospasms. it was scary as all hell couldnt breathe at all they used PEEP (positive-end-expiratory-pressure) they finally had to do an epi updraft I scared all the people in the OR (my coworkers) one nurse stated she hates circulating tonsillectomies now because of me (not really but sort of) guess what I still went back to smoking after that surgery, you would think that after that I would be able to quit but no I wasnt too bright just kept on going until my husbands heart stent placement prompted my and his quit. Addiction is a stupid thing and makes you make stupid decisions. SMH.