I've only used mullein tincture for an earache, and not even my own.
The diet goes a long way, sure thing. But I wasn't talking about those goodies as food, I meant their medicinal uses as herbs that support the lungs.
With garlic, I make garlic tea for the first signs of cold or flu, and if I catch it fast enough, the first signs will be the last that same day. One whole bulb (not clove), crushed, per cup of boiling water, boil for one minute, breathe the vapors while it steeps for another ten, then drink. It loses the bite and tastes surprisingly OK when prepared like that.
Onions -- if there's a virus going around, you just cut one or two large onions in half and put them, open side up, around the room. Helps with malevolent spirits too.
Ginger -- superb breathing aid, make tea with it (strong) or compresses/packs with ginger juice. For the lungs, dried ginger is best, fresh ginger for the stomach.
Horseradish -- if you prepare your own, as I do once or twice a year, your kitchen might turn into something like a battlefield where they use a lot of tear gas and possibly Yperite, and you will keep running back and forth between the culinary task at hand and open air, crying and cursing -- but you won't get a cold or flu that year. Not a chance. Don't use a gas mask. You will survive this, but nothing bacterial or viral will. (I have a very powerful masticating juicer so it makes a whole lot all at once, maybe if you grate it by hand it's not as dramatic, you don't get this level of fumes...)
Mustard shines in hot foot baths for any and all breathing needs. Don't use the prepared stuff. Use mustard powder.
With hot peppers I have a recipe to raise the dead.
Wasabi is self-explanatory.