Mullein is what I consider a gift from God. I had a cough and a tightness in my chest for months. I even ended up in Urgent Care where the doctor told me I had emphysema. Eeek! I used up my rescue inhaler and my son's inhaler then got to the inhaler he had in his backpack (he hadn't been needing his, thankfully). My dear husband read about mullein and found a tincture at our local health food store. It was not very tasty. I wasn't impressed.
I was putting the 30 drops in the last couple of sips of my cooled-down coffee once a day. He reminded me that it was supposed to be taken three times a day. I moved up to twice and sometimes three times a day. After I did that for 2 days, I found that I didn't need the inhaler before going to bed and didn't wake up during the night coughing. I was excited and then made sure I was getting that tincture in anything I was drinking: coffee, water, and OJ. In the mornings, I would get a couple of good productive coughs to clear my lungs (I know, TMI, but I want to give you a heads up). I kept up the tincture 3X/day until I was no longer coughing. It really works!
A friend's daughter who is pregnant was coughing for months. No OTC meds or meds from her doctor were working. She was exhausted physically. I passed on a tincture and some tea bags of mullein. About a week later, my friend let me know that her daughter was no longer coughing and felt SO much better. The only thing she changed was the mullein. She hadn't realized how bad she was feeling until she started feeling better. MONTHS of coughing... over. She can now focus on growing her second baby and caring for her toddler without being breathless.
I keep up the mullein by putting a teaspoon in my tea diffuser EVERY day, and have recently added stinging nettle to bolster my immune system even more.