It wasn't technically in school, but during religion class held after school (because my high school is a public school so they're technically not allowed to hold religion class during school but they get away with it anyways). I was in 10th grade and my religion teacher told me that the sole reason drugs are addicting is because after they're made in MEXICO (apparently they aren't made anywhere else in the world), and as they are being smuggled into the USA, witches wait at the border and put hexes on the drugs to make them addicting. I then laughed, stood up, walked out, and never returned to religion class again.