The right course of action if you know someone who suffers from a gambling issue is to encourage them to get help from a professional. It's possible that they themselves are unaware that they have a problem. Honesty takes the initiative at this point. A hostile tone won't help because they might be feeling guilt and remorse, so keep that in mind.
Search for a potential National Gambling Helpline according to the nation wherein you live.
Search for a potential National Gambling Helpline according to the nation wherein you live.