You really haven't being paying attention, have you ?
In addition to nicotene, he's also under pressure to give up his Blackberry which, if the media are to be believed, is a greater addiction for him.
Personally I would ban blackberrys anyway for anyone who isn't travelling on work related business. Have one myself and am constantly getting in trouble for not responding to e-mails in the evenings or when I am on holidays! Can never understand someone who responds to a non-urgent e-mail from a beach somewhere or at some ridiculous hour.
I thought the secret service had said he can't have one because they are not secure enough. I wish I had that excuse!