Because it does. The only people who have failed to stop smoking using this program, to the best of my knowledge, are the ones who refused to use it according to the directions.

All the rest, regardless of how resistant they were, eventually quit smoking.

Between 2-5% of the population may require more than 6 months of use to quit. If you are still smoking after 6 months of using the program 8+ hours a day every day, simply use it for another 6 months.