I quit by going to McDonalds and getting some straws (they're the same width or very close to a cigarette) and cutting them to be the same length as what I smoked. Then I took a strip of napkin about an inch wide, rolled it up and stuffed it into the straw. It takes a little experimenting but you can get it tight enough to make the same restricted air-flow as a cigarette. Carry several of these with you at all times. When the urge for a cigarette becomes overwhelming, SIT DOWN---that's an important part of it or at least was for me---and smoke one of these until the urge passes. They can be used anywhere and simple as it sounds, it does work.
Also, remember that as with any other addiction the urges will come back for a long long time they'll just get further and further apart. Also, identify the places and situations that you normally smoke. Avoid the ones you can and grab the straws for the ones you can't. I also joined a pretty good church around the same time and that's whats kept me off the cigs.