I would never gamble in the casino where I work (besides it should be at least not allowed...)
I don't think it's a normal thing in general. Those who work in a casino know very well what the real odd of wins and how it works this business

That's true, because if a worker at a casino who is supposed to attend to gamblers during working hours now start gambling, then he/she is likely to get distracted and not offer an effective service during working hours, because inasmuch as gambling is a game of luck, it's also a game that has physical & psychological impact on individuals, of which if a person gambles and lose, he is likely to be sad, which most times are not the right mood for a working environment. Main reason why it's not good to gamble if you are working in a gambling environment during working hours.
I think it's not just about control but more about how someone can understand it and also maintain awareness of the dangers of the risks that lurk, because that way I believe that it is unlikely for them to lose control or get caught up and carried away by the situation.
Yes, I grabbed a whole lot of sense from what you just said, and it's true what this individual may be lacking is self-control, because for the fact that the person O.P is referring to became addicted to gambling due to the fact that he was working in a casino, is a clear sign that that's the same way he would have continued gambling if he wasn't working in a casino. Because thou the environment a person finds himself may have influenced on a man, so for me, I think this guy was already into gambling before they got a casino good.
And on the other hand, maybe
your opinion could also be right that the person might have been involved in gambling before he worked at the casino, and the point is for me, whoever you are, regardless of whether you are a casino worker or not, I think it is unlikely for you not to have self-control along with some other limitations when you do have a true understanding of what and how the chances of winning and the risks actually are.
Yes, that's true, and that's the area I was trying to make emphasize on, that is, the ability of he a worker in a casino to have self control, inasmuch as the environment a person finds himself having an influence to their behavior. And since we both don't have a detailed information about the worker O.P was referring to, our speculation might be right or wrong, which is totally okay, and fine by me.