The effects of psilocybin are pretty well known in US culture. The effects of cathinone aren't.

Miraa and willies

The short life is probably why it hasn't seen much use in the US. I knew a doctor who used to work in Ethiopia and took regular internal flights. You had to squeeze yourself into your seat surrounded by sacks of khat. They had to get from farm to market in 24 hours. Ethiopian Airlines did a great job. But now Americans are going to get deranged cathinone-laden cicadas flying straight into their mouths they can play too.

I can't imagine what the psilocybin/cathinone combo would be like.