Marijuana & hemp are both cannabis sativa (and some marijuana is cannabis indica). But “industrial hemp” (the only source of CBD lawful in all 50 states, thanks to the Federal Farm Bill’s exemption of it from the Controlled Substances Act) CBD extract products are lawful in all 50 states, can be sold on the open market at any store (not just a licensed dispensary) or online to anyone over 18–regardless of the customer’s or mfr’s state’s medical or recreational weed laws.
The aforementioned entourage effect is the main reason behind the efficacy of whole plant extracts. There are over 100 ‘identified’ compounds in the cannabis plant. While most of these compounds have their own therapeutic benefit, they combine synergistically to provide a far better performance than any single compound, including CBD. Here are a couple of examples of conditions that benefit from the entourage effect: