[Cementjungle]

I have a personal theory that marijuana use causes “arrested development.” An emotionally mature 16 year old is unaffected, but an immature 19 year old is emotionally “frozen” until long after marijuana use is stopped. Once frozen, more effort is required to emotionally mature.

I think it's television. For generations now we've been using the TV as a babysitter/educator.

[jjotto]

I have heard of studies that show television itself - regardless of content - alters brain chemistry, especially in young people. But I don’t know how conclusive those studies are.

Drugs, on the other hand, certainly affect brain chemistry.