A steam humidifier will distill the CS out ,which is not the way to go.A cool 
mist ultrasonic,nebulizer type is what is needed.
I have a weakness in my lungs which over-produces mucous.This can and did lead 
to a build-up in them.This led to Bronchial pneumonia and the inevitable 
ABX,with all the attendant problems.
Using the above type humidifier with CS/EIS did stop that go 'round very 
successfully.
I later learned that Fenugreek was very good at reducing the production of 
mucous.This was through finding that my situation was related to Cystic 
Fibrosis in which Fenugreek now plays a beneficial role.
Since incorporating the herb,as a capsule, in my regimen,it has been a very 
long time since I've had to resort to the humidifier.

Harold