A great article on how violent video games affect teens from CG Magazine. I am quoted throughout the piece.
According to the Canadian Mental Health Association, suicide is the second leading cause of death amongst young people in Canada; the statistic is the same over in the United States. While there are a multitude of factors that can contribute to suicide, an American study released in January found that action category videogames can play a significant role in suicide ideation and attempt. The study, published in the journal Cyberpsychology, Behavior and Social Networking, found that individuals who played extensive hours of action games (which the researchers define as first-person shooter, fighting, sports, horror and crime/war-themed games) evidenced the highest Acquired Capability for Suicide, or A.C.S. This is defined in the study as traits (for example, a lowered fear of death and higher tolerance for both physical and emotional pain) that can both physically and mentally prepare one to make a lethal or non-lethal suicide attempt.