The chemicals in wood that are associated with allergic reactions are generally found in the inner parts of the tree or heartwood. A hypersensitivity reaction leading to asthma has been commonly reported as a result of exposure to commonly used woods, including Western Red Cedar, Cedar of Lebanon, Oak, Mahogany, and Redwood. The asthmatic reaction is believed to be species-specific. Dermatitis is also a common health hazard associated with exposure to wood dust. Wood, usually as sawdust or splinters, may affect the skin or mucous membranes by mechanical action or by chemical irritation and sensitization.
Irritant reactions appear to be more common among lumber workers.
Cancers have been associated with wood dust exposure. The three types of cancers associated with wood dust exposure are nasal and sinus cavity cancer, lung and other cancers, and Hodgkin's disease. This study supports the hypothesis that wood contains carcinogenic agents. Excess gastrointestinal cancer in pile drivers. Excess leukemia Iymphoma group cancers in millwrights, mill workers, and lumber and sawmill workers.