How these exposures lead to lung cancer
Asbestos fibers lodge permanently in lung tissue and cause oxidative stress and chromosomal damage. A major peer-reviewed review found asbestos exposure increased lung cancer risk by approximately 70% or more in heavily exposed workers, with risk climbing further when combined with smoking.
Diesel particulate matter penetrates deep into the alveoli. The National Institute for Occupational Safety and Health Diesel Exhaust in Miners Study found workers with high cumulative exposure had significantly elevated lung cancer mortality, even after controlling for smoking and other carcinogens.
Creosote is often used on docks, pilings, and other wooden marine structures and contains mutagenic polycyclic aromatic hydrocarbons that damage DNA and cause mutations in lung tissue.
The unique factor in maritime lung cancer cases is the cumulative effect of exposure. Science shows that these substances interact with each other, increasing the carcinogenic impact of each beyond what any one exposure would cause on its own. Workers were not exposed to one carcinogen in isolation:
- Engine rooms concentrated diesel fumes on every shift
- Asbestos insulation lined nearly every surface of older vessels
- Dock and repair work added creosote exposure on top of both