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Short of science, think of it this way.
When you smoke a joint, invariably on a microscopic level you're also ingesting tiny plant fibers into your lungs. With a good sized bong, the distance travelled and water will remove a lot of that.
Also the heat isn't good for your lungs, and after just a day or two of bong use you can see all the crud that's inside it.. Without it, where would that crud have gone?
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