You have to accept the addiction of gambling because the one who wins wants to win more and the one who loses wants to get his money back so he bets again. I think a gambler says enough when his pocket is absolutely empty. So no matter how much they win in the last game they will come back to lose more than that. An example of your story is that he lost all money by getting addicted to more drugs. Gamblers don't care how much money they have lost even after losing all their money in bets. Because in his head he is forced to gamble only as a source of earning money.