Cannabis, Marijuana, Hemp: What’s the difference and how are they similar?

Member of Cannabis genus, marijuana varies in legality throughout the United States with THC being the primary cannabinoid, a psychoactive compound that binds to the body’s cannabinoid receptors.  Also a member of the Cannabis genus, hemp is legal in all 50 states with CBD being the primary cannabinoid, a non-intoxicating compound that extends endocannabinoid functions and interacts with various receptors in the body including serotonin, dopamine, orphan and TRPV1.  For millennia and without a single reported fatality, both THC and CBD have been used, individually or together, to treat pain and other ailments.