Seeking to identify the plant origins of the early sacramental beverages Soma and Haoma, this study draws a connection between the psychoactive properties of these drinks and the widespread use of cannabis among Indo-Europeans during this time. Exploring the role of these libations as inspiration for the Indian Rig Veda and the Persian Avestan texts, this examination discusses the spread of cannabis use across Europe and Asia, the origins of the Soma and Haoma cults, and the shamanic origins of modern religion.