What causes gambling addiction?

[Alpha13]

Some people can't gamble enough, they seem to be able to play for as long as they are awake. How do you guys think they are able to maintain an interest in playing for so long? I ask because I have the opposite problem, I can't put in enough hours. I play 2-3 hours a day and poker is my only income (live at home student) I don't want to get addicted to gambling but I would like to feel the same strong "urge" to play as the addicts do so I can put in more hours. I hope this doesn't sound crazy [img]/images/graemlins/smile.gif[/img]

Thanks