The cause of the blood could be from minor blood vessels bursting following a bout of coughing, however in a smoker of this length of time then we have to consider more serious possibiities and I would like him to see his doctor as soon as possible.
If it is something serious like a lung cancer then the earlier this is picked up the better. He needs to have a chest xray and a clinical examination as soon as possible. It may turn out to be nothing more serious than an infection but it needs to be looked at.
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