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When someone wins something big in gambling, he starts thinking about gambling very seriously and even if he loses a lot of money, he still cannot think of gambling as bad. If he does not have money, he borrows money to gamble. No one is addicted to gambling in the beginning, he cannot stop gambling because of the potential win and the greed of big winners. And when there is a big win in the beginning, he gets more confidence, so he does not hesitate to take big risks later, even though he loses more than his winnings.
Honestly a big win gives a person a false sense of confidence. Then he thinks it's not just luck, he's playing wisely. This is where the real trouble starts. Later when he starts losing, he still can't stop, because all he can think about is the previous win. It seems that if he plays again, everything will be fine, In fact this thought slowly drags the person down and he doesn't realize when gambling has turned from a habit into an addiction.