http://www.uvm.edu/~susagctr/Documents/Woodsmoke.pdf

Cute last page in Comic Sans, too ;-)

"we conclude that although there is a large and growing body of evidence linking exposure to wood/biomass smoke itself with both acute and chronic illness, there is insufficient evidence at present to support regulating it separately from its individual components, especially fine particulate matter.

In addition, there is insufficient evidence at present to conclude that woodsmoke particles are significantly less or more damaging to health than general ambient fine particles."

That's a good lesson about science: just because an article has serious references doesn't mean it's not bullshit. Don't take the facts for granted if you don't actually read the references.