They're not tornadoes, they're called Hurricanes.
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I haven't seen or tried them, but they look sick.

Nochowderforyou: diffusers make it so instead of a large bubble, the smoke gets broken up into smaller bubbles, leaving you with the same volume of smoke but higher surface area, which lets the smoke cool off more and the water absorb more crap out of the smoke.

I'm not clear on what the percolator does, but I'm guessing it does the same thing? Anyone?