The only thing the cigarette does is remove the aggravation caused by the previous cigarette, so that the smoker, for a moment, feels like a non-smoker. By lighting up, he temporarily relieves the very slight feeling of emptiness and enjoys the state of relaxation and peace that non-smokers enjoy all their lives. But immediately after putting the cigarette out, the nicotine begins to leave the bloodstream and the slightly empty feeling returns. So the smoker has to light up again, and again and again.
