Effect on gambling is depend on you, how you use gambling in your life.
If do you use gambling to play in gambling to get a lot of money. It's wrong, because gambling is not a job but an entertaiment.
You're right gambling isn't a place to earn money because there is no guarantee that you will earn something at the end, it might just cost you a lot of money if you end up betting all you have. It is only for fun as what most people say but we must also control ourselves when it comes to spending our money in gambling.