So in one my hand I'd like people to enjoy gambling but in one hand I afraid it can turned into disaster and I could the person that cause the person become addicted, so I kind of confused when someone come and asked me to teach or explained thing about gambling, should I teach them or I just ignore them? How can I teach or convince them that gambling is only for fun? Is it a wrong idea to teach or convince them to gamble for fun?
If you care about the person, then you don't. You wouldn't want to be blamed for any misfortunes. You wouldn't want your social circle labelling you as a bad influence and possibly a corrupting force that they'd eventually avoid you.
Sure you took to gambling quite well and didn't end up a hobo but the same cannot be said of everyone. Even if it's possible to pinpoint which individual are more prone to addictions, they may also respond to each differently. Me for example never quite got addicted to smoking despite a few attempts during highschool but now consider myself a mild internet addict watching one Youtube video after another.