Here’s a good incense source from NLM.
Take particular note of the first comment. The charcoal used is critical. Many people (and choirs in masse) are under the impression that they are allergic to incense. Some of them actually are—but most are not. Rather, they have a reaction to bad charcoal! The self-lighting stuff will work in a pinch, but should not be used for a proper liturgy. Smokey Mary’s smoke room has an electric table-top burner on which they light up regular briquettes of Kingsford to stoke the thuribles there. I’d even go the extra step and get natural, less-processed charcoal. This can be obtained rather easily at places like Whole Foods.
All the hypoallergenic incense in the world will not help if you are burning it on bad charcoal…