Yeah right, the next thing to happen is instead of quitting you will push to continue as your adrenaline already increase after several sessions of playing, control over yourself is what you need not easy but doable if you are really keen on working on it, those experienced gambler who can manage to limit their gambling activities mostly experience that same problem from the past, but by good practice and determination to work on it, they manage to enjoy either they can sometimes make money or they manage to control both time and money that they are spending while playing.
Yes, as long as they don't have good self-control, they will only continue gambling and probably only stop gambling when the money runs out. So he won't be able to stop gambling easily when he often loses control and doesn't want to learn self-control and train it. Only continuous practice can give him the opportunity to have good self-control so that he will not spend his time just gambling. He will surely see that he actually has other interesting things he can do and if he can do them one by one, it will prevent him from thinking about gambling but will instead do other things and keep himself busy with other things. So, stopping gambling depends on a person's determination and willingness to be able to go through every process he has to do.