7,000 online gamers showed

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Massively multiplayer online games such as World of Warcraft, Guild Wars, and Second Life are becoming increasingly popular. All have celebrated milestones in their user numbers recently, with WOW announcing it has 7.5 million subscribers, Guild Wars selling 2 million copies (including expansions), and Second Life hitting 1 million users--many of whom spend real money in the game.

But games like World of Warcraft are hard to switch off and walk away from, says Professor Mark Griffiths, director of the International Gaming Research Unit at Nottingham Trent University in the UK. That's because they have no end, and there's always someone online somewhere in the world.

A Nottingham Trent research study of 7,000 online gamers showed that 12 percent exhibit at least three of the diagnostic criteria of addiction as outlined by the World Health Organisation. These include: craving, withdrawal symptoms, loss of control, and neglect of other activities.