Hemp no longer a pre-19th century resource!

The longest, strongest, most elastic, and most durable fiber in nature, Hemp yields cloth, canvas, cordage, and other textiles. Hemp can be made into biodegradable plastics, more resistant to heavy blows than steel. Hemp has the most cellulose of any plant, and plastics are made from cellulose. Currently hemp cellulose is being used as a replacement for fiberglass car parts because hemp Biocomposites are lighter and safer than other alternatives.
Hemp can make virtually any building material including caulking, cement, fiberboard, flooring, insulation, paneling, particleboard, plaster, plywood, stucco, reinforced concrete, mortar, and biodegradable plastic. Hemp hurd can be compressed into foundations which are seven times stronger than concrete, half as heavy, and three times more elastic. Even under extreme pressure hemp-reinforced buildings will bend, but are less likely to break, and actually continue to get harder and stronger after they set. I believe that the main reason hemp is illegal today is because of biodiesel's potential. The first diesel engines (by Rudolph Diesel in 1894) were invented to run on hempseed oil; petroleum wasn't synthesized to mimic hempseed oil for over a decade. Therefore hempseed oil was the primary fuel for automobiles for over 30 years after the invention of the first internal combustion engine.

P.S. (important aside comment)

Patients in any of the 12 USA states that currently allow medicinal cannabis are qualified if they've been previously diagnosed with chronic pain, chronic nausea, AIDS, cancer, glaucoma, chronic muscle spasms and other spastic disorders such as multiple sclerosis, seizure disorders such as epilepsy, gastrointestinal disorders such as IBS, Crohn's disease and the inability to eat, or patients who have medical treatments for other conditions that cause one of these conditions.