Linked from
The 10 pages that link to Incense, each with the reason it gives.
PerfumeRelated: Burning aromatics preceded and accompanied the use of liquid perfumes.
AgarwoodRelated: Agarwood is burned as incense for its distinctive, persistent fragrance.
CenserRelated: Censers hold the material whose combustion produces their smoke.
TudigongRelated: Incense is a common offering at Tudigong shrines.