According to the Environmental Protection Agency (EPA), radon is one of the major causes of lung cancer. You could be at risk from radon if you live in close proximity to a well or have used certain types of building product. You can purchase a home testing kit to check for yourself.
Pressed Wood Products (MDF)
Although some pressed wood products are illegal in the US, other are not. You could be at risk if you work with any of these materials for a long time. Symptoms include asthma, itchiness and nausea.