Are you asking me to summarize the debate for you, or is it that you simply don't understand what's going on? Ol' Whack-A-Mole pops up into the debate without a clue. Again.
The poster cut-and-pasted a list of 14 studies, editorials and opinions going back to 1894 from a pro-marijuana blog in a lame attempt to show that marijuana was harmless.
I would say that the Siler Commission, Panama Canal Zone Report of 1930, for example, stating that "cannabis use was harmless, and, having subjected to medico-scientific clinical monitoring, heavy cannabis smoking produced no effect upon motivation or performance", would qualify as an answer to your question.
You disagree?
Half an answer ... what's the contrary new fact?