For the sake of simplicity, let me put a number here.
High schooler between 9th to 12 grade who smoke weed at least 10 times a week all four years will settle in LIFE below 50% of his potential (compared to how he would have done without weed)
He got a 1st in Chemistry.
#anecdatasmackdown
You did not read my post well. You did not know the guy you said did what I mentioned "10 times a week, for all 4 years 9-12 grade", If he did, he is unlikely to reach university. Even if few kids reach university with parents money, they would not have got 1st in Chemistry.
You may still show me 15 guys who reached university top class ranks after doing 4 year high school heavy weed. In the same high school I can show 85 kids (4 year high school heavy weed users) whose life prospects are diminished by the time they finish the collage .
That is the whole point