It's important to understand that stopping is not simply about willpower or determination (qualities that Obama personifies). Smoking is an addictive behaviour and to quit you need to overcome the addiction and learn new behaviour. On the addiction front, Obama uses Nicorette gum. He even handed some out to someone in the crowd who said they were trying to quit. But many quitters use it only when they have a craving. That isn't going to work. You need to chew the gum of the right strength as directed, using up to 15 pieces a day. There are dozens of randomised...