Prolonged exposure to the dangerous chemicals within AFFF increases the risk of cancer substantially. For that reason, those individuals that are most often exposed to fire fighting foam carry the highest risks of dangerous health consequences. Professional and volunteer firefighters are by far the group most likely to face exposure to AFFF on a regular basis. Domestic firefighters are not the only ones that make regular use of AFFF to fight major fires. The military has long made use of firefighting foam to combat blazes that cannot be contained through traditional means. Because of the difficulty associated with fighting jet fuel fires, AFFFs are commonly used at airports. The use of this foam exposes not only firefighting staff at airports to hazardous chemicals but also a variety of other workers as well. The harmful chemicals found in firefighting foam can also affect the community at large. Studies have shown that the chemicals within AFFF have found their way into the water supply near locations where firefighting foam was used.