Life as a smoker is a balancing act
While quitting may result in a person feeling some discomfort for a few days, smokers face discomfort on a daily basis from having to maintain a constant and comfortable nicotine level. Maintaining this level is a constant balancing act.
For more information about the nicotine balancing check out the video Why do smokers smoke? Starting at the three minutes and eleven seconds mark is the section on how keeping nicotine levels constant and comfortable is a balancing act for active smokers.