World of Warcraft: Really addicting?

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Is world of warcraft really an addicting game, or is it just the popularity of it that makes so many people entranced by this rpg? Please, of those of you who play WOW (world of warcraft abbreviated) I would like to have your input, and those of you who have played and quit, how did you stop playing? Did you go cold turkey, or was it a gradual thing?