ya all the time. One time i was smokin with some friends out of a water bottle pipe and my other friend was lighting the bowl and he had his face in it and we were pretty high at the time and i look over at my other friend and he's staring off into space and it made me laugh (even though it wasn't that funny when I think about it sober) and so I laughed and all the ash from the bowl blew back into my friend's face and it looked cool. It didn't burn him or anything.