Marijuana is not treated like a supplement. No supplement is a c-1 substance. No supplement is addicting. The laws are clear on this matter, no individual can legally possess marijuana because there is no fda approved product and so, no legal prescription for it exists.
In the world of controlled substances, when state and federal law conflict, the stricter law prevails. That is why a number of states have gabapentin as a controlled substance and New York treats benzodiazepines like c-2s.
A limited number of cbd products can be treated like supplements. FDA has had to crackdown on them because they were making medical claims