Yup, Ian remembered right. Pg. 197 of Martin A. Lee and Bruce Schlain's book on the CIA and LSD has this. "Kahn experimented with LSD on repeated during bthe 1960's, and he vistited Milbrook and other psychedelic strongholds on the East Coast.from time to time the rotund futurist(Kahn weighed over 300 pounds) would stroll along Saint Mark's Place in the East Village, observing the flower children, and musing on the implications of the acid subculture..."
Turn On, Tune In, Drop Bombs! Michael Pugliese