The Religious Significance of Entheogenic Drugs Hugh Asher More Info: This is my unpublished Master's Dissertation.   Abstract This paper examines the use of psychoactive substances such as Psilocybin, Mescaline, and LSD as adjuncts to mystical, religious or spiritual experiences. There is an analysis of the psychological changes and the changes in perception that these substances cause and how these can be interpreted as contributing to religious or spiritual enlightenment. There is also a discussion on the nature of what could be considered a religious experience. An overview of the use of such ‘entheogenic’ drugs from an historical perspective follows, looking specifically at the use of [...]