I absolutely do NOT drive whilst stoned.
I've driven mildly buzzed before and really feel uncomfortable and unsafe. My limit is a small hit or two before I am like, "okay, gotta just chill here for a while until my brain works again".
I've also tried riding my Ninja stoned before- I made it out of the driveway and turned around and parked the damn thing.
Be responsible people... don't put others in danger.