Originally Posted by
AlericB 
...it's saying that quitting is just another choice that you make in your life and that there's nothing particularly mysterious about it, and the same process of looking at possible future outcomes and deciding on which one to actualise applies just as it does with any other decision you make.
It's really not that simple, though, not for most addicts. There aren't forums and programs and medical treatment centers to help people decide to stop drinking diet soda, say, or take a different job, or move. People don't die from failing to make a decision to stop eating so much cheese, at least not very many people. When drinking turns into an addiction, that they feel compelled to continue despite an increasing weight of negative consequences, it's not just another choice, and most people need a lot of help to make that choice, including those who gravitate towards this particular model (otherwise they'd just make it and be done with it, and have no need to buy a book or even go looking for a book).
Perhaps there's more to it, I didn't read beyond that sentence, but shaking their fists at people who make a choice different from what they'd prefer they make just leads me to stop reading.