Most of Gambler choose gambling for time pass or entertainment. So it's became their hobby and then they got addicted. So, I think for quite gambling we should choose another hobby that we like to do in free time and avoid gambling. And slowly, addiction of gambling will be removed from our mind.
It is not easy as that, because if a person is really addictive in gambling and he is already out of control or out of his mind, having other hobby is not enough for him to stay away in gambling. I think it is better if he will have a vacation with family far away from casinos or no internet connection I think he can overcome of his addiction.
the best way is when you realized that gambling already wrecked your life and already turned everything burned out and you don't have anything aside form your love ones who also in danger to leave you after all the messed that you did i think thats the major part of quitting acknowledging that you already got into addiction and willingness to be cured without it there's nothing left for you.