Simple steps to help you quit smoking:

1. Smoke one cigarette less in a day and keep reducing till you stop.
2. Smoke in front of the mirror to realize you are smoking. Sometimes you may smoke without even realizing as it has become a habit.
3. Keep the cigarettes in the opposite pocket(for example in your left pocket if you usually keep them in your right pocket) or your bag so that you are aware whenever your hand goes for a cigarette.
4. Buy one cigarette at a time and not as a whole packet.
5. Write down the reasons why you are trying to quit in a small paper and keep it in your pocket all the time.

Most importantly NEVER LOSE CONFIDENCE.
On an average smokers make five to ten quit attempts before they ultimately quit.