Voice of Reason:
When you are gambling alone if you should start to lose, the only one who's going to tell you to leave the casino is your conscious, but then you will get the other voice in your head telling you that if you simply risk more, the reward will be even better when you win. If you're gambling with a friend, they can tell you when you're getting out of control and can physically drag you from the casino if that's needed. Of all the different safety nets you can use, this one is the best, just make certain that your friend is a responsible gambler and that he is not a 95 pound weakling to ensure that if needed, he truly can drag you from the casino.
Public Internet Access: Many cafes and restaurants now provide free Wifi access to the internet and for those who don't have a laptop with them, they will have one or two terminals that you can make use of but they are coin operated. Because they are just meant for short term use, it will prevent you from sitting there and losing money for long periods of time, after a half hour or so, somebody is going to ask you if they can use the computer.