I have never met a "high functioning" stoner but what is your experience?
I've met dozens honestly; are you sure you've not met one and just didn't know?
Don't you think all stoners are "HIGH functioning"?

Well yeah and is there not a good reason for that?
Am I the only one here who does not know what "420" mean, other than it is related to drugs and is not a collection of 10 different answers to the Ultimate Question of Life, the Universe and Everything?
Do 420's only smoke one joint per day at 04:20 PM or AM because they think it's a socially acceptable moment to smoke and stay 'clean' the rest of the day?