Connie - I find when my mucus is thick, it is better to nebulize levalbuterol than to use the inhaler - it gets deeper into the lungs.

I think @fracturedd was suggesting a diffuser or vaporizer for inhaling the eucalyptus aroma. Inhaling this way is generally considered safe, but with your issues, you might want to talk to your docs.

On the other hand nebulizing eucalyptus or any other essential oil can be dangerous for a number of reasons. One is that putting oil droplets directly into the lungs can impede the ciliary and bronchial action that clears lungs. Compounds in the oil could interact with medications you are taking. It is not known don't whether the oil will be excreted from the lungs. Please consult a pulmonologist or ENT before you consider nebulizing.

One more thing to consider trying is "Breathe Easy" by Traditional Medicinals. I rely on it to keep my mucus thinned. It is available in many grocery and whole food stores and on line.

Sue