When a person inhales asbestos fibers, most of the fibers are expelled, but some can penetrate deep into the lung and remain lodged there for a lifetime. Asbestos fibers can cause inflammation and scarring, which can affect breathing and gradually lead to disease.
People are more likely to experience asbestos-related disorders when they are exposed to high concentrations of asbestos, are exposed for longer periods of time or are exposed more often.
There is no safe level of exposure to asbestos, according to the U.S. Environmental Protection Agency.