The best approach should be religious practice. As far as I am aware, most religions directly prohibit gambling and anything related with gamblings! So, if a person is already addicted and wants to get rid of their addiction, they should probably practice their religion. At the same time, keeping oneself busy also helps, finding another source of entertainment or simply staying busy. If you don’t have free time to gamble, the addiction will eventually fade. Last but not least, spending quality time with loved ones, they surely helps greatly in this regard!