Having spoken to quite a lot of people I have come to the conclusion that those who smoke now are either weak or foolish. It kills a person, makes them smell bad and makes their skin bad and unatractive. I can think of no utility or reason why it is good except that it feels good to get rid of the cravings for nicotine. Stopping smoking gets rid of those cravings permenanetly, so overall feels even better.
I have a poll running on my (rarely frequented) frivolous blog.
So far every explanation of why someone smokes I have been given falls into one or both of these categories. If you can think of another reason let me know and I will add it to my poll on the frivolous blog.