The Psychology of Hashish is a penetrating early twentieth-century inquiry into cannabis intoxication as a problem of consciousness, imagination, and spiritual perception. Written in Crowley's characteristically ornate yet analytical prose, it blends case observation, philosophical speculation, Decadent literary sensibility, and occult psychology. Situated within fin-de-siècle experiments in mysticism and psychopharmacology, the work treats hashish not as mere indulgence but as a lens through which the mind's symbolic and visionary powers may be examined. Aleister Crowley, poet, ceremonial magician, mountaineer, and founder of Thelema, was uniquely positioned to compose such a study. His training in the Hermetic Order of the Golden Dawn, wide reading in Eastern religions, and lifelong pursuit of altered states informed his conviction that disciplined experience could reveal hidden structures of the self. Published in the milieu of The Equinox, the essay reflects both personal experiment and esoteric ambition. This work is recommended to readers interested in occult modernism, the history of drug literature, and the psychology of mystical experience. It rewards careful reading as a document of intellectual daring, stylistic excess, and serious inquiry into perception's unstable boundaries.

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Aleister Crowley (1875 – 1947) was an English occultist, ceremonial magician, poet, painter, novelist, and mountaineer. He founded the religion of Thelema, identifying himself as the prophet entrusted with guiding humanity into the Æon of Horus in the early 20th century.