@TooLate It's got a few uses. Some use it for tea, as a pain reliever for headaches. Smoking it as a decongestant, one small hit will make you hack up chunks of phlegm. You would have to research it...
Best to test it first by rubbing it on your skin to make sure you have no bad reactions before you try ingesting it. It can cause contact dermatitis for some people.
Just search medicinal uses for mullein.

@UnderLockDown thank you for answering.