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Gravity bong
From Wikipedia, the free encyclopedia
Gravity bong is a term that can refer to either of two devices used for smoking cannabis that use water to create a vacuum whereby the suction created draws air through a bowl to fill the container with smoke.
Gravity bongs differ from regular bongs in the fact that they usually do not filter the smoke through water, they have a far larger chamber, the smoke is much denser than possible in a standard bong, and they are usually homemade. Additionally, rather than the operator reducing the air pressure inside the device through inhalation, this is achieved.