I would consider looking at yerba santa which is an herb that can help with lungs- it helps open up the bronchials, an effective remedy for allergies and asthma and can get rid of phlegm. I met a man over the weekend that said yerba santa actually saved his life. He himself is an herbalist and is quite knowledgeable in that area. I know a very high quality company that has herbal tinctures. It is called herbpharm which if you google it you can probably find it. I always look for the highest quality sources of whatever I am looking for so if someone recommends a company they are familiar with and know of the source and quality, I will take the advice.
I just googled it and apparently vitaminshoppe carries it which is a national chain so perhaps there's one by you. I find they are very reasonably priced and less than health food stores. Also, I have bought their brand of various items as the woman in our store is extremely knowledgeable and has told me that their brands are made by very high sources- some by well-known very expensive companies.
Anyway, I just thought I'd pass this info on. Be hopeful and work towards living... The best to you, Lisa