i can see how it would cool the smoke. i might try this next time igot some weed, water can actual do the opposite of what you want it to do, by filtering out some thc, or even make the tar to thc ratio even higher. only reason i still use water is to cool the smoke.

i don't really even use water i just drop ice cubes in and whenever the ice melts then i have water, that's the only way water gets in any of my bongs. too bad dry ice would be harmful on the lungs or i'd use that instead of conventional ice.