I've seen this behavior in my peers and in myself. Almost always among the addicts like myself you get two responses. "Yea no doubt lmao" or an exhaustive list of other addictions like television, cigarettes, Facebook, etc. trying to rationalize it to you and themselves. I'd like to point out in these cases it is far beyond a hobby. It is self-destructive. Going a day or more without eating or sleeping. Pulling an all-nighter because you just cant seem to get away from it. I've literally seen league of legends ruin a friends future because he couldn't study over getting in just-one-more-match. In my perspective video game addiction is an undeniable truth. And those vehemently opposed usually have a self-image interest in opposing it.