Motivation and planning are extremely important to quitting smoking. First, think of the main reasons you want to stop. Take a piece of paper and on one half write down the reasons you smoke. On the other half, write down all the reasons why you should quit.
Now you have a better idea of what you will lose and what you will gain from stopping smoking. Circle the most important reason for you to quit. Write it down on a separate piece of paper and keep it somewhere you can easily look at it when you need to.