Admittedly I haven't read the article because Vice is blocked at work, but I imagine video game addiction is a lot different from other addictions since it has to do with something you do rather than a state you're in (not to say it's necessarily worse - just different). Serious addicts can play video games for several days straight, whereas I don't think doing drugs for several days straight (at least without doing anything else) is common among even the most serious addicts (though admittedly I'm not an expert in this). I think it would be very difficult to be a "high functioning" video game addict.