I’m not sure the distinction matters to lots of customers. “Synthetic cannabinoids” as a term suggests to customers that they’re buying something like synthetic cannabis, even if it has significantly different effects, and even if it’s chemically nothing like actual cannabinoids. The only regulation (at least in parts of the US where I’ve looked into it) is banning them where possible, but like whack-a-mole new ones spring up, with new compounds and the same implication that it’s ~weed.