Oh, cut the crap, 2641925.
Alcohol and marijuana do not make you inventive. Creative? Sure, since anything is called art these days.
I do realize you didn't argue in favor of alcohol. But if "wandering" is the key, and it is what drugs do, then so does alcohol. In fact, you can just start flapping around on the floor like a fish, or rolling in the dirt, like they used to do in psychiatric sessions of the 70s. You'll achieve the same "wandering" state of mind.
No. It is when you learn things, and then your mind wanders, that you make connections, discover, imagine new things. It's also called called thinking about things. If you go into a world with white rabbits that lead you through holes, it might make for a wild children story, but it won't cure cancer. Despite the fact that those 3 or so Nobel prize winners, whom you can undoubtedly name by heart, experimented with LSD.
P.S. While often arguing "Alice's Adventures in Wonderland" is a description of a trip, none of Lewis Caroll's biographers implied drug abuse on his part. Charles Lutwidge Dodgson (real name of Lewis Caroll) was a mathematician, and a logician.