Exactly the point, you can't just direct them with words but an action is needed to divert their attentions, if the person is very
close to you, then you must find a good way to divert his attentions,.
Putting him in a place where he can avoid some time playing / gambling and give him some breathing to think the right way, best time to have
some serious conversation and give him some hints that he's already getting engage that much.
A good start to bring him back to reality in life and also to allow him to balance his gambling activities and be reasonable in terms of spending
time and money when playing the game.
i somehow agree with you that one of the best medications for those gamblers is to let them understand that they could no longer regain what they had lost, and if there's a chance they can, it will be all depending on their luck. they should also realize that once they enter the pit they will have a hard time climbing up again, and after telling them that they needed to be slowly separated to that hobby or find another hobby to take up their time slowly just like withdrawal methods for those who are under rehabilitation, but still that depends on the very person if they really wanted to still be able to change their life although things are no longer the same. in the end it is only a matter of how those people can accept the reality they put themselves into.