I'm curious what you're really trying to say here and why feel the need to compare yourself to your peers in such a way. Do you feel like you wasted those years because your peers are "smarter" than you now?
(I imagine the friends here are a rough “control” for baseline cognitive potential)
I don't feel that I wasted the years, but I do think that the thousands of hours spent stoned were a complete waste and have decreased the potential quality of the latter half of my life.