To quit smoking, you need to check your addiction and smoking habits. Then, come up with a plan that details the reason why you want to quit smoking and how to do it gradually. Set a quit period and inform family and close friends about it. Remove cigarettes around you and consult your doctor to help you in the process. Go to http://www.cdc.gov/tobacco/quit_smoking/how_to_quit/quit_tips/index.htm for more tips.
I was also a chain smoker once. But I could quit smoking only by myself, nobody was helpful for quitting it. It was I only I who could help myself. One fine morning i woke up and remembered my son's face and suddenly decided to quit smoking, and see I could really quit it. Later, I made myself busy in work and avoided staying alone. It is also useful after quitting smoking to be with those friends who helps you not to start it again.
It's a very hard thing to do. And I have found that chewing gum doesn't really help at all. When you are finished with your next pack, just don't buy anymore. That way there is no temptation. Do activites to take your mind of off it such as exercising, jogging, etc..
A friend of mine chain smoked 4packs of Kools ( do they even make those any more?) And made herself sooooo sick she never ever smoked another cig again. I just took lots of deep breaths. That's all I was smoking for any how... Just to take a deep breath duh!