You will need to have the willpower and commitment to stop playing. Should also find someone to hold you accountable for your gambling. Or you can seek professional help and therapy.
This is must he needs if he can't consult to an expert then he needs to have will power but if that's still not enough and he can't build his own, he needs to spend his time to other things. You can entertain yourself by playing addictive computer games but the result of it is you can skip the addiction of gambling but you will start becoming addicted to that game.