Here's the truth:  Big Pharma can't patent cannabis products because; its a natural substance and its already been in use for decades,
Therefore: they mount an enormous publicity campaign against it, 
and continue to promote their patented pain medicine - opioids that addict and kill thousands of people where now its a full blown epidemic. 4 out of 5 addicts are introduced to opioids by a prescription from a doctor (glorified drug salesmen).