Smoking just a few cigarettes a day is enough to cause long-term lung damage according to new research.More

New US research has found that smoking even just five cigarettes a day or less is enough to cause long-term damage to lungs.

Led by researchers at Columbia University Vagelos College of Physicians and Surgeons, the new study looked at 25,352 participants age 17 to 93 years who were a mix of smokers, ex-smokers and never-smokers.

The participants all had their lung function measured using spirometry tests, which measure how much air can be breathed out in one forced breath. 

Thanks to using such a large study sample, the researchers were able to see differences in lung function among light smokers (defined as 5 or less cigarettes per day) and

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