Incense has been used since before recorded history, for ritual, health, purification, religious offering, and to influence mental states.
Most incense contains aromatic materials, a binder–often acacia gum–and a little charcoal. Purer forms use plant-based mucilage to bind the scent agents, with naturally occurring cellulose taking the place of charcoal in the mixture.
Do not leave incense, candles, or other forms of fire burning while unattended. Burn these items only in a fire-safe dish intended for this use (on a level, heat-resistant surface). Keep candles and incense away from children, pets, windows or drafty areas, and any combustible items.