Experts found that even smokers who underwent rigorous medical tests that came back normal had dangerous changes in their DNA The genes found are usually limited to developing embyros and can predispose a person to the most aggressive types of lung cancer

By Rachel Reilly

PUBLISHED: 05:33 EST, 17 July 2013 | UPDATED: 03:22 EST, 18 July 2013

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Experts found that even smokers who look healthy are undergoing dangerous changes at a genetic level

Even healthy-looking smokers have early cell damage which could lead to cancer, say experts.

A study has shown that even if X-rays and other health test results are normal, airway cells in smokers show early damage by having activated genes seen in aggressive lung cancer.

Experts found that in the cells lining the airways of the smokers' lungs, human embryonic stem cell genes associated with cancer had been turned on.

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Even healthy-looking smokers have 'cell damage at a genetic level which could lead to lung cancer'

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