I cant exactly suggest  what is good for you. However, this is what i did for myself:

• share your quitting plan (I told my brother/sister/close friends that I was going to quit smoking.  Furthermore, I also asked my friends not to smoke.)
• dedicate your quitting habbit to someone/yourself (I dedicated it to my mother)
• plan a date to quit smoking. (I quit smoking since may 3rd 2011 ( ama ko moukh herne din).  But I told my mom after 3 months that I quit smoking. That felt so good)
• when you plan a date ( suppose after 1 week), start reducing your # of cigarettes from today so that it will be easy for you to quit from the start date.
• Be in smoking free zone. If your friends are smoking ( may be outside the room, club etc) , avoid those circumstances and dont go near to them. I know its difficult to avoid friends but you should stick with your plan.
• Once you fix the date. Dont ever tocuh the cigarette. Throw you cigarete packets lighters and associated stuffs.
• Join gym, sporting activity etc

NOTE:
- stick with your plan and remember your promise, your family/closed friends.
- Once you quit smoking never touch the cigarette again.

Background:

• I started smoking 11 years ago. Initially light smoker, just for fun.
• I was trying to quit cigarette since last 1 year. For the last 1-2 years, I smoked 1 Pack+ cigarette per day