I found this amazing Gas Mask Bong in an Indian Shop in London. The bong pushes into the mask. When it worn, the mask creates an airtight seal around your face, so as you inhale the mask fills up with smoke for the ultimate hit. For use with any cannabis , herbal blends.
The bong can be filled with water or can be used without. Either way there is also a carb hole at the back of the bong in order to increase the intensity of the hit.

A bong (also water pipe,"popper bottle", bubbler, bing, bingus or moof) is a filtration device/apparatus generally used for smoking cannabis, tobacco, or other herbal substances.
In construction and function a bong is similar to a hookah, except smaller and especially more portable. A bong may be constructed from any air- and water-tight vessel by adding a bowl and stem apparatus (or slide) which guides air downward to below water level whence it bubbles upward ("bubbler") during use. To get fresh air into the bong and harvest the last remaining smoke, a hole known as the "carburator", "carb", "choke", "bink", "rush" "shotty" "kick hole" or simply "hole", somewhere on the lower part of the bong above water level, is first kept covered during the smoking process, then opened to allow the smoke to be drawn into the respiratory system.


High Times Magazine

Smokers Guide

Smokers as a percentage of adult population

en.wikipedia.org/wiki/Cannabis_
en.wikipedia.org/wiki/Bong