I'm allergic to incense. What can I use in a ritual instead?

Basic fire or candles

According to the Mazateca people of Mexico, Salvia Divinorum was given to the world as a gift by the Goddess they call La Pastora, the Shepherdess. You can burn that in rituals. If you just have a little in an incense burner or smudge stick, it won't give you much of a dose of the psychoactive chemical in it. To use as an entheogen, I recommend chewing it as the Mazateca do, rather than smoking it like a gapacho. ;)