Herodotus is considered to be the father of "History" and recorded rituals involving the use of plants which produced strange smoke by the Scythians.
Seven pounds of gold artifacts were discovered in a Scythian burial mound in southern Russia, including two bucket-shaped vessels, three gold cups, a heavy finger ring, two neck rings, and a gold bracelet. The residue on the vessels revealed traces of cannabis and opium, proving that the Scythians did indeed use these drugs.
National Geographic: Gold Artifacts Tell Tale of Drug-Fueled Rituals
National Geographic: Gold Artifacts Tell Tale of Drug-Fueled Rituals