I can't recall where I heard it, but the essence of it was that in the "ancient times" - or maybe not so long ago - the incense used in churches, temples, etc., was a very definite composition of some 3 or 4 ingredients that together produced a very beneficial health effect.
But this recipe has become forgotten. At least for the most of us.
Interesting video. Thanks, the encenser at the top reminded me of catholic priest during funeral mass smoking hte whole place. I think they used that to purifie the air during the pleague era and kept on doing it as tradition ,