Can people still get the addictive nature through friendly games
It depends, as far as I know someone who already has an addictive nature, just as they are addicted, whether it's to drugs, gambling or other things, most of those who have an addictive nature don't care what friendship is, they keep making small or big gambling bets, it is very likely that they will do the same thing outside, not only at your place, other places also behave the same way, they can't if they don't carry out gambling activities, they have to do it every day.
So am just curious to know if these little games are the one's that got to him or already developed such habit and to know if possible that the practice will continue elsewhere after leaving there when he lost the money and to look for means through gambling to recover it.
Yes, they will continue gambling, they can't stop.