If we win, there is always this urge of betting again, thinking that we are at our most lucky moment, it is normal in gambling, but it all ends up on how we control ourselves. We must never forget to set limitation both in winning and losing so that we can enjoy our gambling moments without sacrificing both our time, health and sanity.
Aways, for me and the most people the hardest thing is to know when we stop, yesterday as an example, I was playing some poker, started with 10$, after a few rounds I had 18$, I could stop or just used the profit to keep playing, lost almost everything and kept playing, when I stopped I had 7$, I could have earned but when I was winning I've started to bet even more.