I think its impossible to stop once you have been addicted, no mater what you do.
it can be done but it cannot be an immediately action. you must learn how to adjust to it and that may takes time. you can try to reduce the urge, duration of gambling, amount gamble etc. so in the long run, it is possible to stop the addiction but it is still depend heavily on the user.
But some people are so crazy about gambling, that once they see a game going on television they hardly have the power to resist themselves from gambling on that. I think some people trust their luck just too much.