Just remember to take 'em with water - you don't want a stiff neck....
Mark Wallingford tells of a smoker friend in Bradford whose wife forbid him to smoke in the house, so he smoked in the yard. His neighbours would come out and bum fags off him (sorry, scrounge cigarettes) so he started walking whilst he smoked. He couldn't work out whether smoking was making him fitter or if walking was giving him bronchitis.