If you have poor self-control, don't play it, it is highly addicting. I went through a stage of being a total wow-addict, but luckily came to a realization of how fucking ridiculous it was that I had to stay at home such and such days because I had to raid.
I've played it off and on since then, but it's never been anywhere near the addictive level. More like just playing any other videogame. It's mostly just a matter of stepping back and looking at the shit you are doing to feed your addiction.
Most people will admit that the best way to cull an addiction, is to fill the void with another addiction! If you have enough addictions, they all take an equal amount of your time, and you suddenly become like everyone else....
PowderHound and TreeNinja