The Swedish Youth Care Foundation has an upcoming report in which they describe World of Warcraft as "the cocaine of the computer games world", indicating that it has been involved in every case of gaming addiction that they have dealt with. As the report is not yet published, it doesn't indicate what other games might be involved.
Swedish news outlet, The Local, interprets this with the headline 'World of Warcraft is as addictive as cocaine', a statement that is neither supported by the quotes, nor apparently supported in fact. The addiction rate for cocaine is 5-6% per use during the first decade and 15-16% per use thereafter. If World of Warcraft were really that addictive, then umpty-million players would be well and truly addicted -- a fact not in evidence. The Local's headline therefore, appears to be purest hype (or as we like to think of it, an attention-getting lie).