You know, I've always suspected that there might be health hazzards associated with incense. Smoke is smoke, no? Culturally though, I imagine that folks will continue to use incense, no matter the risk. After all, burning incense is practically syonymous with worship in some communities. I'm reminded of visiting the Taiwan coastal town of Lugang back in 1987. Lugang was famous for its incense industry, among other things. I remember walking down alleyways and seeing freshly-made incense drying in the sun, similar to some of the photos here: http://www.taiwanderful.net/blog-entry/cfimages/2007/08/04/wanderings-lugang-part-3
Personally, I rarely burn incense. Those rare occasions are usually when a skunk visits my backyard, and I need some incense-defense.
[This message has been edited by Louis Swaim (edited 10-14-2008).]