Great examples include making people wait until adulthood to smoke nicotine or cannabis, or to drink alcohol.

I mean, I agree with you, but highschool is a thing... these laws are basically useless to my knowledge. I think about 50% of my grade had smoked weed by tenth grade, and half again were addicted to nicotine by 12th. The only reason I didn't fall victim to those (as many of my friends did), is because I was educated, by my parents, from an early age, about addiction and these substances. I never even tried them, because I knew better, thus never got addicted.