Have you ever considered how much you "know" isnt true?

Have you ever thought about all the different things you’ve learned in school that aren’t true that you accepted as truth because it came from a teacher or some other form of authority? A good example of this is drugs and what schools tell us, much of which is based upon faulty experiments or downright lies. No im not trying to turn this into a drug talk or anything it was just the first example to come to mind.
Really makes me wonder how much else i think i know but really is a lie.