The first organism known to have an endocannabinoid system was a primitive jellyfish some 600 million years ago. The hemp plant itself didn't evolve until about 6 million years ago. There's obviously some incredibly complex biochemistry going on here that almost a century of barbaric government policy have obscured. For the first 37 years of the 20th century, cannabis was the third most prescribed medicine in America. Eli Lilly actually developed a strain called Cannabis Americana for the medical field.
Morphine was first discovered and isolated from opium in 1804. Nicotine was first discovered and isolated from tobacco in the 1820s. When was THC first isolated and discovered?1964. 1964! And it's been illegal the entire time since. How disgusting that we're still almost utterly clueless about one of the oldest cultivated plants in history because of subservience to "law".