I am sure we can control the emotion but the problem is sometimes we forget how to control his/her emotion, so it makes him/her lose control. I think that will depends on how strong your mind to prevent your emotion to explode because it can cause you to lose everything. If you want to quit gambling, then you will need a strong mind that is always telling you to stay away from gambling.
Every person want and expect that he can control his emotions, but when time comes they forget everything. Its not so easy to continue to control our emotions every time. Sometime convincing ourselves to continue playing gambling so as to recover our lost or to make more profit we lose our emotion which in fact become a big problem for us.
I think that it is important that while visiting a casino we should have a limited amount of money and should try to play gambling with the money that we have. After losing that money we should try to quit and should not take loan from any person there.