It's true that the most addicted people initially had pre-existing mental conditions, if not their common sense should tell them that they cannot win back their losses as they keep on gambling to recover them back. It's a norm that a hard drug addict will gamble, because he will always love to gamble for profit in order to buy more drugs.
Teens are copy cats, they do whatever they see on tv or on social media without knowing the consequences attached to it. Some of them might want to do it for fun, but along the line, they become addicted they don't have anyone to help them.
It's easy for you to see it that way or perhaps I should say you are among the people that has the common sense. Not everyone can think the same, not everyone can let go of money quickly and not everyone can make a logical decision but we all have common goals, whether you are gambling for fun or not for fun, the end game is money has to be made. It's easy to start a gambling when you have the money but it's not easy for some to let casino take their money.
Even when they say gamble responsibly, body written in casino platforms and other physical gambling places for people to see, they don't listen or care about those things. Every semester in my school, student begged the student affairs for extension of school fees deadline so they can pay raise money to pay their school fees, meanwhile the parent gave them the money to pay the fee but they used it to gamble, that's not a sign of common sense but addiction problem.
Of course, everyone has different thoughts even though the goal is the same thing but they are not entirely the same in their thoughts and perceptions in doing what they do.
Some people who gamble are certainly not ready to lose the money they bet, but this is the wrong behavior because with this kind of behavior it will only make them trapped in the feeling of wanting to recover losses or in other words gambling addiction.
There is no sure thing who is most vulnerable because it is about each individual's thinking.
Gambling with money that should not be is the wrong behavior and of course this happens because of a strong sense of wanting to win or in other words addiction, we know that people who are addicted tend to do anything even if it is risky but because of the encouragement of strong thoughts of wanting to gamble they will still do it.