I haven't dug too deep, it would be nice if someone would make a nice summary page of the different kinds of smoke (from cigarettes, exhaust pipes, wood fire, coal fire, incense, leaf and grass fires (as in wildfires), cooking, various kinds of factories, etc.) and summarize the potential health hazards of each. Green wood emits more smoke, but does that mean it's more of a hazard? etc.
Incense may be only 2 grams, but it's also 2 grams optimized for smoke emission, and it's also rarely burnt just under a chimney that absorbs most of the smoke. Though yeah, I agree incense is probably less of a hazard than a wood fire, it's probably mostly a problem in places like Buddhist temples.
Sam Harris, in his recent article called The Fireplace Delusion, tries to make you feel what it's like to react to a cached belief being irreparably destroyed. Just incase you forgot what your apostasy (if you had one, of course) was like in its early stages.
What are some of the Fireplace Delusions you've come across in your days?
EDIT: WOODSMOKE HEALTH EFFECTS