Mullein is my go to as a vegetable carrier material for spice. It's availability, cost and the fact that to me it
is a smooth smoke inform that decision. To some folks it's harsh as hell and difficult to hold in the lungs. Like the poster above pointed out, if someone isn't used to smoking anything, the idea of 'smooth' is going to be a different target than for one used to cigarettes and weed, and in fact might not exist in plants.
Mullein bought in herb stores is processed for teas, not smoking. I've found it's best to treat it sorta like weed, separating stems from flowers and breaking the flowers apart. A nice absorbent bed can be made this way with a good texture that will allow good air flow but at the same time prevent the spice from running away. Still, it has challenges.
Personality I've found mullein (or any plant matter) most useful for EL or changa, and have never had much success with a vegetable sandwich method. Trying to manipulate the combustion of the two materials effectively has been too much of a challenge for me at times and i don't have confidence in my ability to reliably reproduce a 'good hit'.
As forthe hairs, i don't see a scenario in which that would happen given a modicum of decent smoking practice.
Chore-boy sandwiches are very, very effective at vaporizing spice effectively and economically and have become my recommended method for fb spice.
Sine experientia nihil sufficienter sciri potest -Roger Bacon
*γνῶθι σεαυτόν*