Background: I'm a legal MMJ patient and I've been looking into water pipers/bongs recently. I understand that this question can be a little controversial but where I live this is all legal as long as you have the proper prescription. Last few years there has been quite a lot of "scientific" bongs that has been hitting the market and in my to medicate as healthy as possible I would like to understand how they work. I know about vaporizers and I have a few of them, this is a physics question.
So to my question. What are the major fields that come into play when talking drag/resistance, smoke cooling and smoke filtration? My theory is that it is fluid dynamics.
Are there any good books to read to fully understand the mechanics behind the water bong?