Cannabis was the basis for the majority of medicinal patents prior to the discovery of aspirin. It was used for rope, twine, and cloth. Ships were loaded with hemp. The word "canvas" is derived from "cannabis", because that's what canvas was. Sails were made of hemp because salt water deteriorated cotton. Old sails were made into wagon covers and ultimately original Levi's Jeans. And the pressed oil from hemp seeds was used for paints and varnishes. Everyone knew what hemp was. But nobody knew what marijuana was. so why is it illegal?
http://www.otcmagic.com/why-did-marijuana-become-illegal-in-the-1st-place

