That's not true, quitting is not that hard...Even if you are greedy, you just need to experience a extreme loss that could make you think or have a second thought on your gambling habit... I just noticed, those who don't have obligation in life are the one's always get addicted to gambling, and sometimes those who has a problem...
I have friends who even have families and they are gambling very often. I even know one friend who gamble every single day. She will go to illegal gambling den and she has been caught and warned several times by the police. If they caught her in these den again, she may end up in jail but she still dont care.