I don't think gambling is wrong because in my mind , it's simply just a way to earn money or a way to relax . It's only wrong when you're playing too much and let it effect to your real life.
That's what everybody thinks they are doing but they end up addicted and made wrong decisions with their money. I think it's not bad to gamble but if you have an addiction or possible addiction to it, then you should lay low on it and try other habits. We all have things to change in our lives, gradually it would stop if you are willing.