Cannabis is not "meant" for anyone. It is a naturally occurring substance. Whether it has a negative impact on teens or adults is a completely separate question. Just like with alcohol.

I smoked weed from the age of 14 to 24; also dropped LSD about 100 times between 14 and 19 years of age.

I'm in my late 40's now and totally normal. I think I smoked weed like 3 times in the last 20 years and it is not my thing anymore.

Smoking weed was definitely more fun in my youth. Did it affect my brain development? maybe