Documents show that Americans have been using cannabis oil since 1840. Dr. W. B. O’Shaughnessy was the first doctor to prescribe it and by 1906 there were over 123 different companies competing to sell cannabis oil. Then “reefer madness” hit in the 1930s, creating fear around marijuana and hemp that lasted decades. We’re finally seeing a reversal of this thinking. This October, Canada will become the second nation in the world to legalize both the recreational and medicinal use of marijuana and marijuana-derived products like CBD.