The doctor diagnosed him with COPD and advised him to quit smoking immediately.

COPD 是 Chronic Obstructive Pulmonary Disease 的缩写，意思是"慢性阻塞性肺病"。这是一种常见的慢性呼吸系统疾病，主要特征是气流受限，通常与长期吸烟或暴露于有害气体有关。