The word "sativa" means "cultivated." Weed grown for rope and paper is cannabis sativa. Weed grown for oil seed is cannabis sativa. Weed grown for curing cancer is cannabis sativa. Weed grown for getting loaded is cannabis sativa. It's all the same plant. People have been fiddling with the same genetic pallet for thousands of years producing vastly different varieties of cannabis for vastly different uses. Have humans exhausted the weed's full range of possibilities? I don't think so.