Calamus is a common marsh plant. In ezekial God becomes angry when they didn't bring him any "exotic calamus from distant lands." Cannabis was grown distant from the tabernacle (most likely) during this time. Saying that calamus was the correct translation of kaneh-bosm when translating from Hebrew to Greek (the words differ by an accent mark, easy mistake) would have rendered Gods' complaint ridiculous. "Though has not broughten me any common marsh plant from distant lands." (After this episode the tents were filled with smoke).