I got addicted to MMO's when I was in my teens and early 20's. I can say it was a style of actual addiction because I was blowing off school, work, friends, and even relationships in order to play more and more. It was very common for me to play all day and night and that might seem normal to some people but to me I finally realized that it was time to stop it. I still play games all the time but I shy away from all MMO's now because they never end and therefore there is always a reason to keep going.

Regular games do not have this affect on me, it was only MMOs and I have haven't played any of them since Guild Wars 2 and I don't intend to ever play them again.