Top notch. Do you have a reference you can share re. Benzene production at high temperatures? Pretty scary but has my chemistry antennae twitching because it does not seem to make chemical sense. There should be no benzene in well-grown buds. And if it is the result of a chemical reaction in the bud that occurs at high temperatures, would you not also get the same reaction from combustion?
It definitely wasn't the result of benzene somehow being a contaminant in the sample cannabis, if was some kind of reaction. And benzene is also present in cigarette smoke and might also be produced at 392, but tobacco and cannabis are chemically different so they may not react the same. Also, benzene I believe is present in an unlit/uncombusted cigarette.
Unrelated, but here is a journal discussing benzene being found in ecigs with PG / VG mixes and it appears it forms from the PG/VG.
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0173055