A six-year-long study reveals 90% of gamers do not play in a way that is harmful or causes long-term negative outcomes. 10% of gamers develop an addiction to video gaming. Those with video gaming addiction display higher levels of depression, aggression, anxiety, and cell phone addiction than their peers who play games but are not addicted.A six-year-long study reveals 90% of gamers do not play in a way that is harmful or causes long-term negative outcomes. 10% of gamers develop an addiction to video gaming. Those with video gaming addiction display higher levels of depression, aggression, anxiety, and cell phone addiction than their peers who play games but are not addicted.