I can vouch for this. One of my relatives is hopelessly addicted to WoW - he doesn't sleep and often forgets to eat because he's playing that stupid game.

He ignores his friends and family, who have in return given up on him, and neglects all responsibility except for work. Even then, he only gets a couple of hours of sleep a night, and is so exhausted that his mom has to do everything for him - she wakes him up, gets his clothes ready for him, gives him some food, and then drives him to work. He's even got a pillow and blanket in the car because he sleeps on the way there. And he's 22! How pitiful is that?

I'm not saying it's the game's fault (it's clearly his fault, and partially his mom's for babying him), but the game is addictive. He's not the only person I know who's stuck on it, but he's definitely the worst case I've seen.