posted on Sep, 14 2008 @ 05:38 PM
There is no answer to your question yet, Scientists are still working on the reasons that this may happen,
It’s a form of lubricating your lungs but so far there’s not much else to go on,
There’s theory’s that its to much Carbon dioxide in the lungs and its the body’s way of riding it, They suggest to do some running or something
active to help,
But we may have to wait quite a bit longer to ever find out the reasons