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.