I was talking about stress outside of gambling - in everyday real life. Gambling can help us to relax.
If you are stressed in real life, I suggest not playing gambling because you can increase your tension because of many things, whether winning or lose, that will not be good for your health. Instead of having fun and relaxing playing the games, you can spend more money because of something that can trigger your emotion to become bigger. But that is up to you

If a gambler regularly gambling at a certain time and stop it for several days if needed. I think they can enjoy the real joy from gambling. No addiction works between them. They don't even expect high profits. There is no desire to get the money back that spends on gaming.
That means they can enjoy gambling as a form of entertainment and will not rely on gambling to get pleasure because they know that there are still many ways to get that fun. That's what we must do in gambling to avoid the addiction that can come at any time when we hope too much to win from gambling.
Self-Discipline. This is what most gamblers needed to avoid suffering lots of stress and problem during their gambling session. It doesn't matter whatever purpose they have in engaging in gambling activities as long as they know when to stop. Planning, moderating, and applying bankroll risk management will enable us to enjoy our gambling activity without creating any negative impact on our daily activities and financial status.
Yes, self-discipline is something that can help gamblers to avoid problems that can arise during gambling. But the problem is that many people lose this self-discipline because they always want to win. They won't know when to stop because they've been enjoying themselves for too long until they lose all their money for the day. It will cause stress, so they will likely return the next day.