The whole shenanigan is about which comes first,the chicken or the egg
Anti-social people may be more likely to retreat to gaming.
People that smoke cannabis may have plenty of spare time, so resort to gaming as cheap way to fill in their time.
Less time spent with other people generally lowers self-esteem & causes social isolation (like Duh:p ) anyway.
So it's comes down to whether people were like that in the first place and resorted to gaming, vs people that started gaming & ended up social recluses
I'm sure there will be fringes in either side, but my bet would be that the majority of gamers were already social recluses, or have addictive personalities, before they became hardcore socially reclusive gamers.
And worse .. some people end up living virtual lives online -> My sister is a wow addict & 1/2 her friends (many of which she's now also met in real-life) are playing Wow with her anyway The whole wow experience has turned into a networking opportunity .. admittedly networking with people which are unlikely to help propel her up the food chain