Surprising that big pharma is an opponent to a readily-available natural substance outside the purview of patent protections. Quick, better enforce the federal ban. </s>
But then you see alcoholics, smokers with cancer, morbidly obese from food, stabbings... basically, follow the money to see why anything is banned, ever.
Fortunately, things have progressed so far at the state level that it would be impossible for the feds to shut it down now.