To be honest, I don't know if it's possible to reduce an addiction. A friend of mine, a former gambling addict, once told me that addiction is such a thing that you either have it, or you don't. You can't reduce it. He was cured by a professional, and he has no addiction know, and I'm happy for him, but it's from him that I know that only a good professional can help you to end your addiction.
You cannot reduce an addiction but you can control the addiction behavior. That would take a lot of willpower and control of the mind to be able to achieve the desired result. I have seen many fellow gamblers who were able to control their addiction, it did not come in a day as it takes some time. It would require an addicted guy to consult with a professional or a group to help an addict control his behavior.
It's also more preferred to make use of a personal precautionary measure to control self interest in gambling before it turns an addiction which may be very difficult to control, when a preventative measures was already in place, there won't be any reason to sought out for an alternative measures to cure since it has been approached right from the beginning such was sensed, in a nut shell, it is better to prevent addiction or a y unhealthy behavior that might come along with our gambling experience before it turns out of hands that we may not be able to control.