I disagree and I can back up my claims. The sinuses are prone to invasion by foreign items. Dust can carry spores, spores can grow and put fungal items into the tissues. Doctors have actually found fungi - even mushrooms!! growing in sinuses. The nose get sinvaded by viruses and bacteria and as I said fungi. I'll debate the medical science on this til the cows come home and furnish citations to back it up. NOT bullshit anti science.