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In my opinion, the first sign of gambling addiction is that the person regrets the lost money but again and again visits the gaming platform in the hope that today he is lucky and winnings will contribute to changing his life for the better. He comes to the casino not to enjoy the game, but for the result, which often turns out to be not what he expects.
The manifestation of stress, depression, gambling with credit money, etc. is already a neglected degree of gambling addiction which is very difficult to cope with alone.