He doesn't even mention it in Hashish!. He give a very good history of cannabis and its movement over time, and if sensi was a major factor, I'm sure it would get at least a minor mention. Cannabis's main intorduction to the west was with the Scythians, out of the Central Asia Steppes, who smoked themselves out by placing the whole flower, seeds, stems, etc in a burner inside a little personal tent-like head cover and inhaled the smoke that way. And they got it from someone else in Asia. He goes on to do the history of hash production around the globe. Very interesting and informative book. It can be had on amazon. :thumbsup: