What CM said. Plus,pine trees have mold and stuff on them, and if you are allergic to the mold, but not the pine itself, you can react. That is DH's problem. He is allergic to the mold on the tree, so before we bring it in, we have to spray the crap out of it with anything that might kill the mold (he likes to use Lysol, but I cannot breathe if he uses that, so I put Listerine in a spray pump and that works pretty well too).