Mr Proctor and his wife both manage to stop smoking. He is started on appropriate treatment and fares very well over the next 5 years. Unfortunately, one weekend he experiences symptoms suggestive of a "cold" and tries to "shrug it off" by staying indoors and taking regular paracetamol. On Monday morning, he makes an appointment with his General Practitioner as he complains of being more breathless than usual and is expectorating purulent sputum.
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