My focus will be on incense and using it to create moods or even as medicine.
"Since the dawn of civilization mankind has used incense for numerous reasons among them medical and spiritual practices. With the discovery of fire, the use of incense naturally followed. In fact, the word incense comes from the Latin verb incendere, which means “to burn”."
Read the full history of incense at http://socyberty.com/history/the-history-of-incense/