Danar Pratama Putra, Nurfitri Bustamam, Aulia Chairani Fakultas Kedokteran Universitas Pembangunan Nasional Veteran, Jakarta Abstract Background: Smoking is responsible for approximately 90% of COPD. Smoking cessation is one of nonpharmacological managements for COPD patient. This study was aimed to determine the relationship between smoking cessation and the severity of COPD based on GOLD 2013. Methods: […]