Why Can Some Smokers Just Quit?

Some ex-smokers will say that one day they just decided to quit and they did, walked away from their cigarettes and never had another puff. It's like a light switch being turned on, going from not wanting to quit smoking to becoming a former smoker. For some smokers when that light switch turns on, they are more likely to stay quit than if they decide to delay quitting by making a plan, they do