There is a theory that talk of "those susceptibile" to gambling is in fact astroturfing by gambling corporations to make it seem like they're only damaging the weak willed.
And you're not weak willed are you? So nothing to worry about. Bad things only happen to bad people.
Good point - random or unpredictable rewards are known to be compelling/addictive for rats, and the same trick seems to work on most humans as well.
Though as I understand it much of money in gambling is made from "whales" - players who lose lots of money and keep playing anyway. The same term is used for f2p game players who spend a lot of money on in-app purchases, often tokens for virtual slot machines for desirable in-game items.