Although I used to smoke a lot a decade ago, I have never really been addicted to nicotine myself, but I did witness my father go through withdrawal symptoms when he attempted to overcome his nicotine addiction. It is my opinion that the best way to go about overcoming nicotine addiction is by slowly weaning one's self off the substance bit by bit. I don't think you can overcome it by simply throwing your can of chewing tobacco one day and just go on like you've never been hooked to that stuff.
I'm not quite sure how this relates to chewing tobacco but if you were a cigarette smoker, it would translate to cutting down the number of sticks you smoke as the weeks go by until you can come to a point where you only smoke a few sticks or even none at all. If your addiction is really that bad, I would suggest that you seek professional advice or even medical help. Of course, one needs to go through this trial with lots of prayers. I will pray for you.
Joel de Leon
under care - Christ Presbyterian Church, OPC
"To doubt Gods mercy because our faith is feeble, is rather to rely upon our faith than upon the Lord. It is not the excellency and great measure of faith that makes us righteous before God, but Christ whom faith does receive and apprehend: which a weak faith can do as well as the strongest. - John Ball (Puritan)