We used to go out and harvest our own, in Kentucky and Missouri, and a couple of hits would give you halucigenetic flashes.
It's been 20 years now, and I have seen nothing like that, and besides, it's way too expensive.
Supposed THC levels aside, today's stuff wouldn't get a fly high.
Today's pot, mostly grown in the Carolinas, from what I have heard, could make a cup of coffee nervous. It's often a jittery, somewhat uncomfortable high. No comparison to the Panama Red, and the Acapulco Gold, and the Lebanese hash, and the good ole fashioned Thai stick we grew up with in the late '60s early '70s. Of course, I gave it up long ago, but this is what I hear.