Everyday my friend gambles with his money as same with his life and he always gambling throwing away his money for nothing but losing and the worth part of it is he owes me money

if there is anybody who is gambling this way, then it is obviously a waste of time and a lot more harmful than you may think because this way of gambling will lead to addiction and a lot of money loss and you should start helping your friend stop right now before it is too late.
And I can tell you that unless there is a goal to be achieved in gambling its all done in vain, I mean if you have no goal then you will try to win 100$ then 200$ and then 2000$ and one day you will loose all in the dream of becoming the richest man lol so better don't gamble if you cant set a goal.