There is no doubt that quitting smoking, especially cold turkey, is not an easy task to accomplish. People develop a habit of smoking cigarettes in work breaks, after meals, driving, and especially when they are getting social with others. So, the first thing you need to do is estimate how many cigarettes you smoke a day. Once you have this figured out, pick a number you think you can manage. For example, if you smoke a pack a day, try and get through tomorrow with only smoking 18. This may seem small, but if you accomplish this goal, you can set yourself a new goal.
If you have friends that smoke, especially at work, you will find it really hard to resist the urge of lighting one up at your work break. Staying inside doesn't feel right either. In such a case, go outside, take a cigarette with you, but don't light it up. Tell yourself that you are saving it for the next break.
If you follow the tips above, before you know it you will be down to half a pack, and probably feel better about yourself. Now just try and cut back more and more as the days go by. In a month or two you may only be smoking after lunch and dinner, which is only two cigarettes a day!
If you are still having trouble, you can try to make a list of pros and cons of smoking. For example, the benefits of smoking would include better health, increased stamina, longevity of life, better smelling clothes and breath, and better health of people around you.