Q. A 58-year-old man with a 30-pack-year smoking history presents to the medical outpatient department with persistent cough, wheezing, and shortness of breath. He says these symptoms have been gradually worsening over the last six months, despite using an over-the-counter albuterol inhaler. On examination, he has a prolonged expiratory phase and bilateral wheezing. His SpO2 is 94% on room air, and a chest x-ray shows hyperinflated lungs but no focal infiltrates. What is the most appropriate initial management for this patient?