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.
I believe that once someone knows that they are addicted,
they can do something about it.
This is harder for people who don't realize they are addicted
I think that people that they now that they are addicted you can just bet and realize that you are not addicted.
The problem is that you can't stop is that when you need to search help from your family or friends you with the addiction.
Running example is the good way to stop gambling, because you can get addicted to it.