Good effects makes us less stress but having those bad effects makes us also more stress.Good or bad effects of playing gambling there are some benefits the more important is we cannot be addicted on it to not loose at all.
It is stressful because it includes money, people want to win, they want to earn money, so the stress becomes unavoidable.
Losing money makes a lot of stress for every gambler because in the first place, they dont want to lose money. There a good effect of gambling but of course it wont last for long term since most of the gamblers are failed to succeed in just short term of gambling. These only mean that gambling is not safe in the long run and we must do this with control and moderately.