Some good points have been mentioned here.
If I were to develop a cessation plan for a client who wanted to quit, some additional factors that I think are important that are independent of the specific technique used, are:
1. Before you "decide you REALLY want to quit", identify WHY it is that you do want to quit. This is THE most important factor. List the health and life benefits and costs that you would gain if you did quit (as well as the advantages and costs of continuing smoking). It is extremely important to link these reasons to your program. Being around longer for their family, and avoiding cancer are a couple that motivate a lot of people. If your reasons aren't that important to you, I don't think any program will truly work for you.
2. Understand that lapses (as opposed to relapse) are likely, and plan for them. The best predictor of smoking cessation plans is the number of quit attempts, with the average person taking 8 attempts prior to being successful.
3. Avoid environments that are conducive to smoking or make you think of it.
4. Reward yourself for succesful periods of non-smoking. Personally, a new flashlight is a good motivator
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There are many good programs out there that you can find. Look up Behavioral smoking cessation interventions and see what you can find. These have been found to be the most successful in the long term. If anyone else needs help designing a program, they can PM me.