First, I did check Robinson's book--no citation. Lowe was a botanist, Latimer a PhD and Mozeson was an Edanist. None are qualified in the Hebrew. The "Hebrew University" thing appears to be an urban myth.
I apologize for assuming you didn't, then. :] I'm curious, do you own the book? I tried to look online to see whether I could check the book for citations, but I couldn't find anywhere to check for such a thing, short of buying the book itself. Of course it was 4 in the morning so I wasn't thinking very clearly and might have missed a way to do so.
A botanist should be an entirely legitimate source about plants in ancient text.
Just because Latimer was not Jewish or an etymologist doesn't dismiss his point of view. People are entirely capable of doing research and learning, are they not? :]
Mozeson's a professor of Jewish and Biblical Literature who's also chairman of the Hebrew Language Fellowship of the Root and Branch Association [not sure what his being an Edenist (not Edanist, btw. Those are people looking to create a homeland for Autistic and Aspergic people) has do with dismissing his opinion and research on the matter.]. A perfectly legitimate and credible source.
If you like, here's a Jewish person :]
Anthropologist Vera Rubin (Jewish, so she knows the language and is certainly qualified to comment on it) stated that cannabis "appears in the Old Testament because of the religious and sacred aspect of it." (Rubin 1978)
I'm still not sure why the big deal on the matter of cannabis being an incense is. Myrrh, frankincense, ambergris, even calamus if you reject cannabis as the translation, all are common incense ingredients in the Bible, and all are drugs that can have psychotropic effects. Even cinnamon and cassia, also incense ingredients, are mild stimulants. Cannabis being added to that list hardly suddenly introduces some sort of sinful drug effect that wasn't there before.