Gambling can be for entertainment only, it should not be considered as a means of earning money. When someone is more inclined to gamble to earn money they always lose their money, and when they try to gamble more than 1% of their weekly income or even more than that, they are leaning towards addiction. So they should avoid this addiction because once he becomes completely addicted to gambling, he is prone to losing his original money. Yes he can gamble but once every week or 2 to 3 times a month, then he should keep a fixed amount, when he loses his fixed amount he should stop it. Because if he deposits money there to start again, it will become a bad habit for him.