When you no longer have fun when you play, just take a break to start fresh later. Gambling is a game that is meant to entertain us. If you see it as a business that can be profitable, you're doing it wrong. You should stop when it's starting to affect your financial situation.
For me, gambling is all about fun. Once you loose that, it's time to rest and a break can be good.
People will find it hard to have fun anymore when they faced a bad result (lose) and unfortunately at such situation, people tend to forget their previous plans regarding gambling. People will keep chasing their previous lost instead of stopping at that point.
I believe gambling won't bring real happiness in the end.It is just made for fun,having it during leisure time.But sad to say lot of people here consider gambling as their source of income to the extent of making it as a priority.The moment a person started to think like that,it's already a negative sign and should be stopped right away.Or else it will cause damage to his own properties in the later part through selling it or having it mortgaged.