Some (mainly Lyndon LaRouche and his followers) have charged that Huxley was a British intelligence agent, sent to revive the ancient Egyptian Isis cult, centering around the use of drugs. They also charge that Brave New World was a blueprint, rather than a warning. I doubt that these folks even read the book, much less the non-fiction follow up Brave New World Revisted, in which Huxley expresses his fears that the chemically controlled society in his book is becoming a reality. He did, however, see promise in LSD, mescaline, and other psychedelics for expanding human awareness.
Huxley was turned on to mescaline by Dr. Humphrey Osmond, who in turn was introduced to the drug by Alfred Hubbard. Hubbard personally guided Huxley through his second mescaline trip and his first experience with LSD.
Huxley was also friends with Dr. Louis "Jolly" West, and suggested that West try combining LSD with hypnosis.
(Lee, Martin and Schlain, Bruce, Acid Dreams, Grove Press, 1985, pg 46-8)
Huxley was also interested in parapsychology, and lectured on the topic at Duke University. It was at Duke where Huxley had contact with J.B. Rhine, who reportedly did experiments in psychic phenomena for the CIA and the Army. (Lee and Schlain, pg 48)