ThankQ.
I’ve been using a combo of Fir Balsam EO, along with Frankincense, Eucalyptus Globulus, Tumeric, and Oregano in a (non-water) diffuser to kick out the stuff in my lungs, and it works every time. Often, within hours. Not the most recent, though, but it helps me in starting my day. Not that I understand it, but the combo works.
I think the strongest of the bunch is, by far, Oregano. 1-2 drops. It causes me to cough it up. (Sorry about the TMI aspect of this post... :/ )
I will def check out the Russian and Canadian firs!!! It’s so cool that you can collect the needles from the Douglas fir on your property.
(Your probably know these two websites, but just in case: draxe.com and drericz.com for lots of health info... two of my go-to-places for all kinds of info, including EO recommendations. Used to go to mercola.com, but haven’t in a long while. Just not enough time to peruse it all.)
We should post this on the natural health thread. I keep meaning to go there and post. I’ll ping you when I do.