> I'll never stop being fascinated by how radically different the experiences of cannabis users are

Nothing to be fascinated about. The experience is different primarily from the type of strain they have inhaled or ingested.

Sativa only strain - High, euphoria, very social

Indica only strain - Sleepy, lethargic, somewhat anti-social

Sativa dominant Sativa-Indica hybrid - Not so high, still little euphoric, smooth come down after few hours.

Indica dominant Indica-Sativa hybrid - Not so sleepy / lethargic, little euphoric...

And then there's the CBD dominant ones which don't get you high, and supposedly cure you of various illnesses. Not FDA approved.