I believe the human body was designed to function at a much higher level than most of us are achieving. Whether that is due to nutrition, stress, lack of sleep or something else. Personally, I believe it has to do with our spirit inside being in tune with the Creator's Spirit. This is definitely an interesting concept, however, using drugs to short-cut may be missing something important. (sort of like the movie when things fall apart...)
I heard we only use 5-7 percent of our brains capacity.