My grandpa has been gone for a bit over 10yrs now, but when he was around, if anyone in our family was ever putting something off, he would tell the same "lesson":
Human nature is to use any excuse they can come up with NOT to do something. It's thw way our brains are programmed. What would your life be like if you flipped that programming around and used any excuse you could come up with TO DO IT instead?
Instead of saying "I'm not going to quit today, it makes more sense start on New Years", why not say, "It's Monday before Christmas, it makes sense to get a head start on 2013". Or instead of "New Year's resolutions never work," think about the scenario where the Mayans would have been right, and consider the fact that the world didn't end as a "free pass", tell yourself, "we narrowly averted armageddon, I'm not going to waste it."
Or go buy yourself a new pair of shoes and tell yourself, "I got a new pair of shoes, I'm not going to chew anymore because I have new shoes."
As silly as it sounds, one of my uncles and his son quit chewing a few years ago literally because they bought new boots. They both needed new boots, and both wanted to quit, they went into the shop, bought eachother a new pair of boots. They told eachother they wouldn't chew in the boots that the other had bought them.
Any excuse to do something good for yourself is the right excuse.
Good luck and God bless to all of you toughing it out, keep up the good work!