Incense have been burned throughout history for many purposes. Be ware of new age teachings involving the use of scents however. See the sacred holy scripture for guidelines related to the context in using anything natural, and avoid getting deceived by the spirit of divination. The bible warns: 2 Timothy 4:3-4: "3 For the time will come when people will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear. 4 They will turn their ears away from the truth and turn aside to myths." These do have a useful purposes however; There have been some peer reviewed journals published on the scientific inquiry into the use of scents and aromas, and even plant oils for therapeutic or medicinal applications.