I've tried to do this before by trying to talk with my friends at various times about the negative consequences of video games and telling them they should abstain, or at least not spend entire fucking days, on playing video games. For two of my friends, video games are deeply rooted in their lifestyle and frankly their lives don't have any form besides video games, it's the main thing you can talk about with them. In guys this is so because they get a deep satisfaction from video games, which I believe acts as a power surrogate. Without them they feel powerless, unable to achieve things at the pace that they can in videogames. This is what I had too, games were and are still a part of my life, significantly less now than before though. In my adolescent path to tear games away from me though, I was on my own and doing this for my own sake, not because my parents or my girlfriend or my friends or my teachers were telling me that it would be good for me. I can't get other people to follow the path I took because part of it is that you have to discover yourself a bit.
It doesn't really matter if you have very strong reasoning; once I was talking with a friend in real life about videogames. He's not one of those two who are addicted, but he's the only guy who I can have actual discussions like this with. For everything he said I could respond concisely against it, until we both came to agree that video games are, in multiple ways, only a net negative on your life and that you are better without them. He acknowledged and agreed, and told me that he knows it is not rational but he does not care, and he will keep playing games anyway. Going back to the original topic, I think what my experience tells me is that it is innate in people to want to free themselves of this, I dont mean to talk ourselves up as some special people or anything. It just seems to me that when it comes to these digital things, most people refuse to have their minds changed by anyone but themselves.