So many modality of treatments are available for quitting smoking these days. Like nicotine gum , patch , lozenges. Other medication which reduce its craving are naltrexone, clonidine , bupropion, varenicline. You consult any deaddiction specialist or psychiatrist and you will be helped out. Besides it you may need to work on high risk situations which may be responsible for your relapse. You need to learn good coping skills as well to control yourself in situations which arouse your desire to smoke.