In a country where gambling is legal, and there are no regulations about age restrictions
Not true, there are age restrictions regardless of the fact that gambling is legal in some jurisdiction. This not withstanding it will not be proper to expose students to gambling. Gambling is something personal and so it doesn't affect every student since not all students are involved in gambling. Bringing gambling discussion in schools will only amount to flooding the school curriculum with unnecessary things.
I would say the same thing, instead on making students would really be able to avoid gambling then it would rather be creating that kind of impression on which it might really be leading up
on engagement just because they have gotten curious on what the school is been teaching. So it would be better to leave it that way and also when it comes to awareness towards things on which it isnt really just that limited to gamblign will already be a job for those parents or simply with their guardians.