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One is that they're already tired, and they understand that they will never win against the house. That's why they're stopping gambling and spending their money on something they will benefit more from.
Next, when a gambler wins a lot. While it's hard to control greed and hard to cash out when emotions are high, there are still a lot of gamblers who are disciplined.
Lastly, when things get worse and they do unnecessary things just for the sake of gambling. Family is being affected by it and due to that, relationships are destroyed so they end up changing themselves by stopping.
I want to hear more ideas about how someone stops or controls their gambling habits. 
Too many ideas about that but here are a few. One is that they're already tired, and they understand that they will never win against the house. That's why they're stopping gambling and spending their money on something they will benefit more from.
Next, when a gambler wins a lot. While it's hard to control greed and hard to cash out when emotions are high, there are still a lot of gamblers who are disciplined.
Lastly, when things get worse and they do unnecessary things just for the sake of gambling. Family is being affected by it and due to that, relationships are destroyed so they end up changing themselves by stopping.