Tamara (Fort Collins, Colorado) on 01/05/2010:

Warning

Do you have a carbon monoxide detector? Is it working? About a month ago a friend of mine had a 3 week cough that was getting worse and started sounding like it could've been pneumonia. Then, one day her landlord came over to check the furnace and found it was breaking down. They measured the carbon monoxide levels and found they were nearly fatal. After replacing the furnace with a new one and installing a CO2 level detector she was immediately better! No coughing and her roommate felt better after suffering from persistant cold and flu-like symptoms. Please check your CO2 and radon levels, since radon causes lung disorders as well.