Re: New Hookah idea? or is it.
Diffusion is an interesting topic. If you are talking about water filtration (another shaky topic) then the idea of running it through multiple water chambers is legit but has been done in a few different ways. The video posted is one and really what you are making is a second hookah for it to run through.
If you are talking about actual diffusion there is no real reason. Once it's diffused once it just reforms into a cloud and it's properties have not really changed.
I like my smoke to be flavorful over cold. The colder the smoke gets the weaker the flavor gets.