Exposure to radon gas could do it.
On July 21, 2009, a United Nations committee said radon gas in homes is directly linked to a small risk of lung cancer. Based on the report, the World Health Organization and other agencies are in the process of revising their recommendations on maximum radiation doses for homes and workplaces.
According to an earlier report by a government committee that was set up to review Canada's radon guidelines, lung cancer caused by exposure to radon gas killed 1,589 Canadians in 2001. It accounted for more deaths that year than accidental poisonings, homicides and drownings - combined.
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Radon is radioactive, noble gas, which is hard to spot. It is outcome of innate putrefaction of uranium is present in many households. It can cause lung cancer. Those homes which are situated beneath the third floor need to get their homes tested for levels of radon. By creating pressure variations in the house or by fitting a radon mitigation system prior to constructing can stop radon from seeping into the house.
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