Hey Englishrick: How do you feel about a paper (German) published in Springer Nature 2019. They are talking about the origin of WILD Cannabis. They did a pollen study and stated that wild Cannabis originated on the Tibetan Plateau in China near Qinghai Lake. Their method was to use pollen studies and trace Cannabis back to the beginning. I see a bit of a problem with this study. There was a gap where they used Artemisia pollen which is almost always found growing with Cannabis. Artemisia is a short shrub normally found in dry or semi arid climates. I would feel better if they actually found Cannabis pollen in the gap. Wild Cannabis could have originated in the usual areas, but so long ago I don't see how they could pin it down so exactly.