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As for the 'self-help' method - helping your friend by taking him to different places - it's a heartwarming thought, truly. But unfortunately, you can't just "vacation" away from addiction. The person will need professional help, either from a psychiatrist or a support group. No one is an island; we all need help at times
Gambling addiction is a serious psychological condition and requires professional intervention and support. You have correctly pointed out that a break from gambling is not enough. Overcoming this addiction requires professional help. It’s important to understand that getting over gambling is a long process, and you don’t have to do it alone.
Yes, it requires therapy and rehab. Gambling addiction is like being addicted to alcohol it is slightly similar but it is very hard to stop and you really need professional help for it , it cannot be done by yourself only. But if you have self control , why stopping someone to gamble ? as long as he knows his limit, has disciplined and proper money management I think there's nothing wrong with it.