my friend has very limited access to paraphenalia, and so has resorted to making pipes at home. he knows not to smoke out of foil, and so hes started making pipes out of other stuff (like regualr clay, and that stuff that dries in the oven) im not sure how safe it is for him to be smoking out of some of these things... but he doesnt seem to want to heed my advice. so, is it safe to be smoking from clay? from oven-drying synthetic clay? he says it doesnt literally burn... but i dont see that a necessarily a sign of it being safe. anyone know anything about this?