I'm probably a little different than most in that I started dipping in my mid 30's. About 3-4 years of what I'd call "social" dipping followed by 5 years of almost daily. My wife tried to get me to quit, so did my kids, and I tried a few times, but felt a little resentful about being forced into it and it never took.
Can't say it's the same for everybody but for me when I decided to quit on my own I just quit. One day in early October (can't even remember the date) I just said I'm done. I had 1 pouch left over, dipped it the next morning and have not looked back since (about 90-100 days).
Just got a clean bill of health from the dentist (I was certain I had developed tongue cancer after quitting) and only very rarely do I get an urge (my triggers are 1st cup of coffee, after lunch, 1st beer, and outdoors stuff like camping or yard work, golf etc). When I do, those Teaza and other tea leaf dips fill the void plenty good enough.
Just wanted to say hi and thanks to this site. It was the first useful place I found after I decided to quit even though I was skeptical on the whole your mouth hurts worse after you stop thing.
So to sum up, don't quit because other people are telling you to. If you want to quit, just do it. Don't plan it. Don't get paralysis by analysis. Just when you decide never buy another can and do it.
Edit--Read back up some of the other messages. If you are the guy doing 5 cans a day, you should probably not follow my advice. Though not a physician I can guess its possible you may actually die if you stopped cold turkey. For you, seek the advice of a doctor.