"After the burial the Scythians cleanse themselves as follows: they anoint and wash their heads and, for their bodies, set up three poles leaning together to a point and cover these over with wool mats; then, in the space so enclosed to the best of their ability, they make a pit in the center beneath the poles and the mats and throw red-hot stones into it. . . . the Scythians then take the seed of this κάνναβις (kannabis) and, crawling into the tents, throw it on the red-hot stones, where it smoulders and sends forth such fumes that no Greek vapor-bath could surpass it. The Scythians howl in their joy at the vapor-bath. This serves them instead of bathing, for they never wash their bodies with water."
What's especially fascinating to me is that Herodotus wrote that account circa 440 BCE, within a few decades of when this find has been dated, and his "Scythians" were probably part of a larger cultural group of Indo-European nomads stretching to what is now Western China.
Thought it was strange that such an ancient word would closely match what we call it today... The etymology page on wikipedia credits that term as the origin of the modern word.
Maybe a reference to something like what got the Oricle of Delphi high? Is it just reference to a regular Greek hot bath?
A bath or Thermae as they are known as which are still in existence today. 
probably not. contemporary writers connected the oracle's "powers" to vapors rising from the spring below the temple.
I do like the idea that the original use was in a hot box though.
I wonder what they mean by high potency. I was under the impression that cannabis strength has increased a lot in the past 30 years. Do they mean that this ancient cannabis was of a strength similar to modern cannabis or just that it was higher in THC concentration than a natural plant would be?
> Researchers have found remnants of cannabis at ancient sites in Central Asia before, but the latest discovery points to the intentional use of plants with high levels of the active compound, THC, and to cannabis being inhaled rather than ingested.
> “To our excitement we identified the biomarkers of cannabis, notably chemicals related to the psychoactive properties of the plant,” said Yimin Yang at the University of Chinese Academy of Sciences in Beijing. Specifically, the scientists found cannabinol, a substance produced when THC is oxidised. Given the lack of other cannabis breakdown products, the scientists believe the plants were selected to be high in THC, but whether they were cultivated or found in the wild is unclear.
Bubble Hash (mixing with ice and filtering frozen resin) is a natural alternative that comes close, but the processing still lowers the quality.
Found it: https://www.youtube.com/watch?v=X2p6qFT_Zjg
It is in present-day far western China, an area which is historically in the Indian/Iranian sphere of influence.