For the 5 years or so I smoked a pack or two a day, the only thing I messed up was putting a yellow stain on one corner of my monitor which was near the ashtray.
I quit smoking, doesn't make me intelligent, neither does Nigel calling people who smoke feeble minded make it true.
If you want to comment on what it means to be a smoker, start. Smoke for a full year or two, a pack a day, none of that in the cheek puff it in and out crap that the people that want to look 'cool' do. Learn what addiction means first before you comment on it, it really makes you sound stupid. As an addict on two fronts one of which is now gone, I know.