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These sturdy glass water pipes not only filter fine particles from the smoke but also deliver smoother, cooler hits. Some bongs also offer percolators (percs) for greater diffusion, condensing and cooling smoke even more for massive rips! Whether it's for flowers, dry herbs, or tobacco- savvy smokers have known about water pipes for millennia!  Glass bongs filter and cool dry herbs or tobacco to provide a kinder, gentler smoking experience, often with internal percolators to create an even smoother smoke.