A radioactive gas that gets trapped in indoor spaces accounts for 3 to 14 percent of all lung cancers – and our toenails could reveal our long-term exposure to this gas.

Radon , a colorless and odorless gas, is the second-leading cause of lung cancer after tobacco smoking, and yet non-smokers and occasional smokers often do not qualify for a lung cancer screening.

A team of scientists from the University of Calgary in Canada have found a surprisingly simple way to detect a person's long-term exposure to radon , which may help doctors identify this missing cohort of people who are at risk of lung cancer, even though they have never picked up a cigarette, rarely smoked or quit long ago.

Toenails are one of the body's 'archives' of our long-term exposure to environmental toxins l

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