If you are unable to quit in this fashion, the next step would be to see your doctor and ask for help.
This help is usually in the form of nicotine administered in slowly decreasing doses with gum or a patch on the skin. This nicotine will partially reduce the craving for a cigarette.
Some patients will benefit from a support group of people in a similar situation. One such group that I can personally recommend from my own efforts to kick the cigarette habit is Smoke-Enders.
Don't give up if you fail the first time. It is very hard to quit. You will eventually succeed.
Once you have quit, you will reduce the risk of developing lung and other cancers, BUT: Damage has already been done, and your chance of getting lung cancer is about 2% in the next ten years.
My best advice is that you have a chest x-ray at least once a year, and preferably every six months. If your insurance will not pay for it, then pay for it yourself. It's the best way to invest the many hundreds of dollars you have saved by stopping smoking.
Your risk of lung cancer will diminish over the years after you stop smoking, but it will always be considerably higher than in the never-smoker. For this reason, I recommend that the x-rays be done regularly, for the rest of your life.
For other good sites with information and help with kicking the habit, try
NicNet: Smoking Facts and Quitting Tips
and The Tobacco BBS "Hints" sectionThe Tobacco BBS, Gene Borio
Quitnet is another tremendous resource for anyone trying to stop smoking.
Quit Smoking Todayand the associated Stop Smoking Ring are wonderful resources for a person trying to quit this nasty addiction. There is a wealth of information on how to stop smoking at The Great American Smokeout Web Page.
Physicians can get information on smoking cessation for their patients at
CCSH Guide Your Patients to a Smoke Free Future
American Lung Association had such a service available at http://www.lungusa.org/ffs/#Sessions:, but I can no longer find it at that address.