The Chillum is a kind of narrow funnel made of clay and other materials like wood, stone, and glass. The narrow funnel is used for smoking when it has a filter stone inside it otherwise the smoking substance will fall right into the mouth. To avoid burning of hands chillum is mostly smoked using a cloth.
Chillum comes in small as well as large sizes. Smoking small chillums brings hot smoke directly into your throat whereas the larger pipes bring the colder smoke, and the more smoke gets into the lungs.