The general population does not commonly become ill from asbestos they are exposed to. However, asbestos exposure becomes a health concern when high concentrations of asbestos fibers are inhaled over a long period of time. Individuals who are exposed on a day-to-day basis as part of their job are at highest risk of over-exposure. Although acquiring an asbestos disease from a single, high level exposure is rare, it is well documented that asbestos related illness from continuous exposure at high concentrations may take anywhere from 10 to 40 years to develop.