first time i ever did it, my friend told me it was some green packed up in his bong..i took the biggest rip i could and got damn. as soon as i exhaled, i was on some differentl level type shit. not even really in the same reality we are..i had no concept of time, reality, life anything..i was kinda just repeating the same moment over and over again..ala groundhogs day kinda
the last time i ever did it, i smoked it out of a bong sitting on my friends couch, exhaled and same deal got real fucked up..but it was more fun..one of my friends walked up the stairs and the whole room seemed to follow him..like everything left all around me, and it was all just plain and blank. when he came back down, the room came with him. i drank orange pop and it gave me funny sensations all over my body.
there were a buncha times inbetween, but those 2 stick out the most.
edit, i dont even know if these make sense, its hard to tell what its like, try it if you wanna!