When it comes to performance and diffusion. Nothing comes close to a good bong water pipe. Ranging from 3" micros to 4 footers. Bongs all have one thing in common, WATER! Water is used as a filtration medium to sift out some of the ash and unburnt product as well as making the smoke less harsh. This is especially beneficial for patients with weak lungs and want to medicate without putting unneeded stress on their body.
 
Bongs also have the benefit of customization, extra percolators and other filtering contraptions can be put inside ranging from domes, trees, showerheads, ratchets, and all forms of discs. American Glass artists have been pushing the envelope of this art form for over three decades.