A number of researchers are conducting studies as to whether or not the addiction to Massively Multiplayer Online Role Playing Games (MMORPGs) can be harmful to gamers. A recent report from Dr. John Charlton, psychology research fellow at the University of Bolton, found that “incidences of addiction could be 10% lower than some currently accepted classification schemes suggest.”
10% lower or not, I personally know of a few people who have been so addicted to an MMO that it would undoubtedly be considered harmful. Moderation is hard to stick with sometimes.
Source: Daily Tech