By disallowing people who smoke from smoking in public, it will cause smokers to smoke less.The law prohibits them from smoking in public areas, so cigarette consumption is reduced.Also, should they have an urge to smoke in public they will put in extra effort to quash the craving because it is punishable by law.In addition, there is less temptation for smokers who want to quit smoking if the ban is enforced because no one will offer them cigarettes.As a result, their cigarette consumption reduces and they smoke less.Therefore, this allows them to abstain from smoking.