Recoginizing that you need to quit is a very important first step. However, since nicotine to harder to withdraw from than heroin (as I've seen guys get off horse but continue to smoke even though they don't want to), you're going to need more than sheer will to quit successfully.
Philip Morris has something called "Quit Assist." It's for smokers -- but the techniques can be used for chewing tobacco as well:
Contact the local chapter of your American Lung Association, too:
You can also look at this site:
Talk to your doctor or insurance company, too. Bottom line? You need a plan. A way of coping on a day-to-day basis. Nicotine gets out of your system within 72 hours -- so the addiction itself isn't physical -- it's psychological -- so creating ways of distracting yourself are paramount.
Whatever you do, figure out a way of getting off chew. Smoking two cigarettes a day will not hurt you. It's the 5, 10 and pack a day levels that are harmful. Me? I smoke two a day -- then toss the pack. Otherwise, I'd be chaining the things. But that chew will give you mouth cancer for sure.
If you won't do it for yourself -- do it for your kids -- who might not want to be burying you sooner than necessary -- and after half your face has been surgically removed.
Best of luck to you. Find a program, get a support group if you need it, and take things one day at a time!