I’m not referring to the people who gamble once in a blue moon. I’m talking about those who gamble habitually.
How come they’re all such garbage people, with legitimately no exceptions? Take a look at any high-stakes poker table and everyone except maybe the dealer is a de-facto scumbag.
I think it’s probable that gambling, or any other habit that strongly activates certain reward pathways to the extent that it can form an addiction, would change your behaviour patterns in broader ways.
Almost all characteristics are both nature and nurture, and frequent gambling could change the balance of your personality.