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Pranam esteemed yogis,

I have an idea that I'd like to run by those of you with knowledge of the respiratory system. I have bad lungs. I'm not a smoker myself, but I've been around smokers all my life. As a result of that - and other environmental contributing factors - I find I often have trouble breathing. I want to find a practice that will fix that, but I need more information.

So what I really want to know is this: can inverted asanas, such as sirsasana, be used to drain fluids from the lungs? Or does the body have any mechanisms - such as valves - that might block fluids from draining out of the lungs, once inhaled?

It occurs to me that by regularly inhaling steam into the lungs and then draining the water back out into the esophagus by doing inverted postures - and perhaps deep or rapid breathing while inverted - I might be able to unclog any gunk in the alveoli, thus making it easier to breathe. If that is the case, great; but if not, I don't want to get stuck with a bunch of fluid in my lungs that can't be easily removed. Pulmonary edema just isn't my idea of a good time. 

Am I on to something here, or is this a bad idea? Or, would this be ineffective for any reason? Any advice would be very much appreciated. Thanks in advance. 

"The mind is a dangerous weapon, even to the possessor, if he knows not discreetly how to use it." - Michel de Montaigne 

"The time is short and the subject is vast" Vivekananda