I've only ever seen anecdotal evidence. My thoughts are that videos aren't a problem, they are a sympton. As in, someone who shunts the rest of their life for video games is problaby having more important life issues and video games are their easiest escape.
Every story I've ever read about people who's lives have been "ruined by video games" also had big time issues of depression (loss of job, shitty grades, relationship break up, etc).