i dont understand the dangers of gritty weed

glass doesnt burn, so i suppose the fear is that when you pull on it, little glass bits will fly into your mouth and lungs. wouldnt you be able to tell if little bits of glass were getting in your mouth?

also, once you finished smoking the bowl, wouldnt there be little glass bits all in the ash? then you would know for sure.

but still, i dont get it