SMOKER'S  LUNG (human) - slide 104 - shows a profusion of black carbon particles within the macrophages.  These cells are everywhere in the section, sometimes singly, sometimes in large aggregates ( as around blood vessels).  Look with oil for the nuclei and cell boundaries of individual macrophages, to get  a sense for the relatively large size of these cells.  Clumps of refractile yellow material seen in this section probably represent hemosiderin.  With low power notice that alveoli are collapsed, making identification of  "lung" more difficult.  The presence of bronchioles lined by respiratory epithelium is diagnostic.  (You may see some pathology in this lung, including large rounded areas of fibrotic tissue.)