Hot smoke activates chemicals in the PVC piping that in turn releases carcinogenic smoke. It's best not to use PVC. Copper will also react to the smoke and release cancer causing smoke.
GARN Reviewed by GARN on . Coco Bongo sorry i cant get pictures, ok i just made a bong out of a coconut, and the tube is a foot long pvc pipe painted red yellow and green and it has this bob marley sticker on it, and the bowl/slide mechanism is a copper bowl connected to a bamboo reed type thing, its completely airtight and everything, and the smoke kinda tastes like coconuts Rating: 5