Taper, plan, quit
Set a quit date. Cut down to 10 cigarettes a day or lower by then.
Anticipate triggers that will make you crave smoking
(being with other smokers, drinking, waking up, etc.) and prepare other things to do. Consider replacing nicotine (gum, patch etc.) which can double your chance of success. Call your doctor and smoke-free friends for help. If you don't quit forever try again! 1-800-quit-now.