This is really good information regarding the questionable history of cannabis.
I think it's highly unlikely that psychoactive use of cannabis is a more modern phenomenon.
I think they even found some fire cannabis in the mummy tombs too :D

I do believe that Cannabis and other drugs have played a HUGE part in our development

As you said here in another comment.
I very much agree.
I watched Bill Hicks talk about his theory of evolution, and it very much involves mushrooms. Makes perfect sense to me :)