Why will one have to gamble under any form of pressure? If you are in tension of any kind, you should stay away from the casino and don't have to gamble at all because your judgement and decision about your gambling habit will be based on your mindset.
Unless you totally depend on gambling for survival, if you don't play and win any day, you won't have anything to go back home with. That's the only time I see that someone can be gambling under tension, as if their life depends on it.
That's the only time the person can be gambling under tension, which is not a good thing for anyone leaving their normal life to do, so to answer your question, I have not gambled under any form of pressure before, and if I'm having any form of unbalanced emotion, I don't even think about visiting the casino because I might end up making the wrong decisions.
People do gamble because of sudden situations, this have happened many times around me, like someone who needed money to take his mother to the hospital, the bills was so much that he decided to give gambling a try, since no one wanted to help him, luckily he won some money and he cried bitterly, he said he knew he could lose the money but something kept telling him to try.
Situations do make people engage in things they are not into at all, when pressure arises, humans can do anything depending how the level of the pressure, may we not know what it feels like to have no choice than to do something even if we don't feel like, the thought of losing something very darely to you can bring tense into your body and you won't hesitate to make some decisions.