I've been REALLY addicted to Gambling a while ago, but managed to escape through one day: managing my money. It's hard for the first two days, but then it becomes easier and you can get past the addiction.
You can't just stop by trying to slowly decrease the time you're playing in casinos.. You have to either stop it now and forever or you will not succeed it. Managing my money means limiting the amount I got on me. And that means having the exact amount for lunch and other stuff I have to do in the city, just so I won't have any other cash on me to go gambling with. This way I was able to abstain from gambling.