sucks i tried it, taste like crap and doesnt do a thing! the onl9y half decent one i ever tried was called like wild greens or somerthing like that from herbalsmokeshop.com at least that tasted and smelled just like the real thing, though it had no physcal effects but its good to hide yoru real stash in so if someone finds it you can claim its all legal
most of that stuff is just shit. but there was one time that i tried this stuff from herbsmoke.com i think it was called spirit walk or something weird like and it sorta got me like alittle relaxed but the taste was shitty. i was really bored so i smoked like a whole bag of it. my advice, dont bother with that crap. it probably screws up your lungs pretty bad.
My mate bought a pre-rolled joint from our nearest headshop for 50p. Smokin it made me feel sick it smelled so disgusting.