My first recollections come from elementary school. I remember having a health teacher that told the class that acid stays in your body forever.
Then middle school I had this guy telling us that pot caused damage to the reproductive system and made your dick shrink.
Freshmen year of highschool a different health teacher asked the class to write an essay about what we thought the government should do about drugs, to be rebellious my thesis was that they should be legalized and I surprised even myself by comming up with several reasons. That started a debate with the teacher that lasted until the end of the year, his only remaining argument was that he feared more people would use drugs if they were legal.