May need some Tests: Persistent cough can be due to smoking(bronchitis) or other lung diseases. Since it has persisted for one year, you should get a medical check up to find the cause. A simple chest X-ray may reveal any obvious problems but a CT scan of the chest is even more detailed and more reliable test to find a cause like Cancer(which is unlikely) in the lung or in the back bones.
Answered 3/14/2017
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