Why Bongs? / The Bong Concept Making a bong is very simple, because the concept of a bong is simple. When you toke, you are bubbling the smoke through water before inhaling it. This text phile will take you through various aspects of bongs and bong-making. I hope you will find it valuable and I hope it inspires you to make your own bongs. The reason for using a bong is mostly for health reasons, though people love using bongs for many more reasons. The active part of marijuana, THC, is *not* water-soluble, so you will not lose any of your high by hitting a bong instead of a joint or pipe. The water does filter out many of the impurities (the resinous tar), thus saving your lungs from inhaling crud. Very hot water will remove the most impurities, and very cold water will cool the smoke for a smoother hit.