I don't smoke cigarrettes, but do enjoy a fine cigar from time to time (I mean <1 per week, and will often go for a month or more w/o burning one -its something I do when I feel like I've earned something 'extra special', but we all have our reasons one way or the other, for things we do). At my facility, the smokers are few, and while I may burn one once in a while, I never do at the hospital (while >I< may enjoy the aroma of a premium vintage cigar (expensive? yeah, but still a treat), I shudder at the though of one of my patients, nauseated due to their illness, getting a good whiff of a strong Partagas Black Label, or maybe a Questa Rey Pyramid #9 Maduro). All the phenergan in the world isn't gonna make 'em feel better.
Personally I could care less if you smoke or not, but I prefer not to, at the hospital.
Its easy for a non-smoker to say 'just choose not to smoke!', but all the patients dieing of a cigarrette, still smoking another one, show that its just not that simple. It takes a desire, and an enormous amount of willpower.