There might be a lot of harmful effects through gambling.
The biggest problem of all is to hurt their family. Almost every gambler takes their entire time to think that how they can win the game. At that point, they already cannot live usual life. And it might be getting worse, if you lend money from a private moneylender. They also could visit your family to get their money back.
As I told you, once you are obsessed by gambling, you couldn’t think straight. It might make you to lose your job also.
And in some countries, gambling is illegal. It says that you can be a criminal.
In Korea, a gambling addiction is treated like a drug addiction. If you start gambling in earnest, you can lose everything you have including your family.