Breathing difficulties: causes and when to get help. Image 3: comparison of healthy lung and smoker's lung. a healthy lung is unhealthy lungs drawing reddish in color. after smoking for many years the chemicals from the cigarettes stick to the lungs turning them a black color. this is because the lungs act as a filter protecting your body from harmful chemicals. instead of them entering into your airways, your lung. By e. j. mundell healthday reporter friday, may 8, 2020 (healthday news) -you're sick, perhaps very sick, so you head to the local emergency department fearing the onset of covid-19. Unhealthy Lung Smoking Bad Lung Drawing Stock Photo Edit Now All the best lungs drawing 34+ collected on this page. feel free to explore, study and enjoy paintings with paintingvalley. com good lung bad lungs 1138x1095 0. Each lung is enclosed inside a sac called pleura, which is a double-membrane structure formed by a smooth membrane called serous membrane. the outer membrane of th...