I don't give a crap that you think there aren't individuals out there that are stoners consumed by the drug. I know better and so do you.
No, you think you know better.
You've ignorantly decided that your world represents the whole of the world and everything, everywhere else is the same as you experience it.
This is why you foolishly obtain your erroneous assumptions:
... from brothers and sisters and friends of brothers and sisters and other people I attended school with.
Which is the very definition of s self selecting sample. If you did a stats course, you'd know that.
What this self selecting sample gives you is a result you can have no confidence in. If you did a stats course, you'd know that.
Making decisions, of any nature, based on observations in which you have no confidence is a foolish thing to do. If you did a stats course, you'd know this.
Basing your judgement only on the massively limited scope of your own life experience is something only someone who knew nothing about statistics would do.
In short, you simply do not have enough information to make the pronouncements you do. But you do it anyway.
I think what would help, maybe, is a stats course.