[citation][nom]beardface2[/nom]For anyone who watched the show, it did show balance. The point being, some people have addictive personalities. You can be more prone to becoming addicted to something. And when this compulsion, replaces all other "hygiene" factors in your life (eating, washing, socialising etc), it is dangerous. To use some of the extreme examples above (though I've not heard of anyone reading books at the expense of all other things), it would be of a similar concern.[/citation]
This.
This study could be done on any extracurricular activity. Of the people who are addicted to video games, there is almost certainly a level of psychological dysfunction that manifests itself in addictive behavior (OCD, ADHD, anxiety, depression, etc.). The neurological symptoms associated with gaming addiction is similar to those of other addictions, such as gambling, sex/pornography, thrill-seeking behavior, etc. The act of pursuing pleasure is one of the basic functions of human personality. One of the underlying mechanisms of motivation (cf. Freud's concept of the Id) is to reduce anxiety and increase pleasure.
In short, a person who has a symptoms of a psychological disorder (either acute or chronic) has a high likelihood of becoming addicted to whatever provides them pleasure, even a video game.