Soma, Eleusis and the Entheogen Hypothesis

Wasson's most influential and most contested claims concerned the identity of substances central to two major ancient religious traditions. In Soma: Divine Mushroom of Immortality (1968) he proposed that Soma, the sacred plant of the Vedic hymns whose exact botanical identity had been debated for over a century, was in fact the mushroom Amanita muscaria, an identification that remains debated among Vedic scholars rather than settled. A decade later, with the chemist Albert Hofmann, discoverer of LSD, and the classicist Carl Ruck, he co-authored The Road to Eleusis (1978), arguing that the kykeon drunk at the climax of the ancient Eleusinian Mysteries was an ergot derived psychoactive preparation rather than an ordinary beverage.

Both hypotheses remain actively debated rather than confirmed: no direct chemical residue analysis of Vedic or Eleusinian preparation vessels from the relevant period has settled either question conclusively, and specialists in each field continue to hold competing positions. Wasson's lasting contribution is less any single confirmed identification than the field of inquiry he opened, treating the possible role of psychoactive plants in ancient religious ritual as a legitimate and researchable question rather than dismissing it outright.