That is why it is important for gamblers to have control over themselves. Because if you don't have it for sure when you win, you won't think of stopping playing instead, even more so when you gamble because you will feel that you can beat the banker.
That's right, if someone doesn't have strong control over themselves then it is possible that they will become an addict and it is very dangerous if someone is already addicted to gambling. It is possible that their behavior will change 180 degrees by behaving unnaturally such as gambling excessively without limiting the money they will bet and gambling all the time in pursuit of the win they want. So it is true what you said above that self-control is very important in gambling so that we don't get addicted and especially prevent the risk effects of gambling.