I think it's both.. either way.. it doesn't take a rocket scientist to grow weed, but it can't be done by any ol' idiot either.
Pick up a book, read it cover to cover. then you can put as much art into the hobby as you want...some people prefer to put more science in it... hydro, bubbler systems.. so on.

alot of people would learn alot of things about growing weed, if they'd just pick up a damn book.