If you see incense in your dream, its dream interpretation is that prayer is being suggested by your brain.
If you use incense to pray, then your dream interpretation would be prayer. A dream symbol holds the same meaning as what you normally associate it with, during your waking day. If incense is associated with prayer, then seeing dream imagery of incense, means prayer.
If you use incense to smoke out a room to get rid of insect pests like houseflies and mosquitoes, then the dream interpretation that works for you, is an insect repellent.