Plan for it. You might even hold a small ceremony when you smoke you last cigarette, or on the morning of the quit date. Talk with your doctor about quitting. Support and guidance from a physician is a proven way to better your chances to quit. Begin an exercise program.
Exercise is simply incompatible with smoking.
Exercise relieves stress and helps your body recover from years of damage from cigarettes. If necessary, start slow, with a short walk once or twice per day. Consult your physician before beginning any exercise program. Do some deep breathing each day for 3 to 5 minutes. Breathe in through your nose very slowly, hold the breath for a few seconds, and exhale very slowly through your mouth.