While hemp is of the same species as marijuana, the latter breeds have been selectively bred for the female plants to produce a lot of the resins which contain the drug. For this reason, marijuana growers carefully cull any male plants, because once pollinated, female plants stop exuding resin.
So growing hemp is the *worst* thing to do to those growing marijuana, as its pollen will pollinate their female plants, significantly reducing the quantity and potency of their resin; and even their seeds will produce far lower grade marijuana.
An analogy is that someone raises AKC Bichon Frisé female dogs for sale, and their next door neighbor has a bunch of male dachshund mutts, and a fence between the two is in disrepair. Not only are the Bichon Frisé significantly devalued by becoming pregnant, but their puppies are worthless.
So the bottom line is that hemp and marijuana are “apples and oranges”. Hemp is an exceedingly useful raw material, and marijuana is, well, marijuana.
The only reason hemp has been outlawed is because it *looks* like marijuana. But if you wanted to smoke it to get high, it would take a wheelbarrow of it to do so.
Ditch weed tokin.
OK Professor, this may be exciting and new to you, but lots are well versed in your dissertation long ago.