Hi Nicotine replacement therapy gives you nicotine without the other harmful chemicals in tobacco smoke. Many people mistakenly believe that nicotine causes cancer, but that's not the case. Nicotine replacement medications, including patches, gum, lozenges, nasal spray and inhaler, can help relieve difficult withdrawal symptoms and cravings. The best time to start using nicotine replacement medication is on the date you've set to stop smoking. Some smokers start earlier in order to reduce smoking on their way to stopping altogether. I would suggest you to consult psychiatrists or addiction centre for counselling first ...it will increase the chance of quitting...