There is a big benefit to learning about how to gamble well as a kid, but that is offset (in my opinion) by learning that it is good to gamble. It needs to be drilled into a good gambler's head that they should take good bets as long as their bankroll supports it but avoid bad bets. Most people who learn to play poker don't learn that.

Incidentally, I believe that it is also good to teach teens about fine wines and spirits (to expand their palates) and how to drink in moderation and avoid hangovers (to help them in social situations). Many people who start drinking early also don't learn those lessons.

Kids also pick up a lot from context, so if you teach your child to gamble using a dreidel on a holiday, it is a very different thing than teaching them to gamble with online poker (for example). It's very easy to learn the wrong lessons from games like poker and blackjack.