I think it's important to differentiate between physical cravings and emotional cravings. Physical cravings are easy to beat - just get off the stuff, and your body will soon function normally again without it.

Emotional cravings, though, are tougher to deal with. If you're applying the addiction model to sugar, you have to acknowledge that you're abusing the substance to escape feelings or problems; to numb yourself. What has you so messed up that nothing but sugar will make it go away? Why is it so hard to tell that pouty child in your head, "NO. No sugar."? Why choose to have the sugar when the consequences of not having it would be very good? Conquering those cravings involves finding better ways to deal with stress, etc. It's a process. If you decide ahead of time that it'll be too hard, you will probably fail at it. I think that's a motto: "Whether you think you will succeed or fail, you will be correct."

I guess the other correct aspect of the addiction model for sugar is the fact that you have to be *really fed up* before you kick the habit for good. The benefit of giving it up has to outweigh the temporary instant gratification.