Mullein should be used in pretty much all smoking blends as the base material. Mullein is often used in pretty much every herbal smoking blend, active or not, as the foundation. It is a very comfortable smoke, very easy to smoke, has respiratory healing effects, burns well and smoothly, and is just overall a very pleasant smoking herb.
As far as inhaling plant matter goes, mullein is probably your best bet. It's still going to be a bit harsh - just comes with repetition. If you don't smoke weed or haven't ever smoked cigarettes, its gonna be rough until you get accustomed to it.
I would recommend getting some mullein or a nice shamanic herbal smoking blend, or just making a blend out of your chosen mixture for changa but not infusing it and practice smoking it regularly until your lungs feel more accustomed to the hits. This also brings some nice benefits health and mentality wise depending on what blend you use!!
"Just because it exists, doesn't mean it can't be done." - JG
Psilocybin plants your roots, LSD spreads your branches.
DMT turns your tree-ass into a damn rocket ship.
Friends don't let friends use freebase.