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

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.

http://www.dailymail.co.uk/health/article-2366641/Even-healthy-looking-smokers-cell-damage-genetic-level-lead-lung-cancer.html?ITO=1490&ns_mchannel=rss&ns_campaign=1490