Quote Originally Posted by Shai Hulud
The California NORML/MAPS Smoking Device Study

Here's a quote:
The least bad waterpipe, the bong, produced 30% more tar per cannabinoids than the unfiltered joint....This suggests that water filtration is actually counterproductive, apparently because water tends to absorb THC more readily than other, noxious tars.
Touche. Thanks for the link... I still wouldn't touch the water though.