Pine trees are covered in mold. While this isn't an issue when they're outside in the fresh air, mold thrives in your nice central-heated house. After just two weeks inside, the number of mold spores in the air increases more than sixfold. And if the knowledge that right now you're inhaling thousands of tiny, fuzzy bits of fungus isn't enough to make the germaphobes among you hold your breath until you're blue in the face, don't worry, it gets worse.
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While most people might just come down with a stuffy nose and a bad cough, all that mold can be much more dangerous for some. One study tested various kinds of pine trees and found 53 different types of mold, 70 percent of which could lead to respiratory problems, up to and including bronchitis and pneumonia. You might recognize those as dangerous illnesses that can land you in the hospital and/or kill you dead.
And if you think you're going to outsmart Death by setting up a fake tree, good luck. While those plastic abominations are a bit better for your health, they're still covered in a year's worth of dust, all of which gets dispersed in one room when you set it up and can lead to an asthma attack.