For mild/moderate COPD, does Mullein tea/tincture help clear lungs?

Background-RLower lobectomy 8 months ago Stage 1A NCLC w/mild to moderate COPD/Emphazima (not being treated for). I guess I'm still having post surgery effects from lobectomy as far as right rib discomfort, chest tightness, but experiencing some shortness of breath depending on what I'm doing, so I guess I attribute that to the surgery, but also the COPD. I was a smoker for decades, & I still smoke 4-6 a day after no success with patches. Has anyone used Mullein to loosen mucus & to clear lungs, help with breathing etc? You can use it as a tea or a tincture. I want to try it, but am wondering for COPD, have you tried it? I want it to be safe, but effective