A 40-year-old patient presents with cough in the morning with production of mucopurulent sputum and elevated body temperature up to 376°C. He has been smoking since he was 17 years old. Objectively, auscultation detects coarse respirations and diffuse dry crackles in the lungs. Complete blood count:leukocytes — 12 • 109 /L, ESR — 19 mm/hour. Bronchoscopy shows purulent catarrhal endobronchitis. Make the diagnosis: