I've had some of that gritty green and looks nothing like the pictures,my m8 took some over to the dam and got it tested by some head gardner there who claims it's microfidre sand.This is added to stop it drying out and to add more weight to the deals.Now if this is true about the above surely if this was really harmful the goverment would release a statement warning people of it.So if this is the only thing i can get i'll carry on smoking it until i'm warned about it.

Ok someones bound to come on here and say the gov wouldn't warn you about,cause they will if there's some bad coke ect they warn you so why wouldn't they do the same about green