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Is the cellular response to cigarette smoke predictive of the phenotypic variation of COPD?

The adverse health consequences of cigarette smoking are not limited to the lung but also include effects on multiple other organ systems that are exposed directly or indirectly to the hazardous gaseous and soluble compounds generated by burning tobacco. Cigarette smoking (CS) is a risk factor for many major diseases including chronic obstructive pulmonary disease (COPD), atherosclerosis, cerebral and coronary vascular diseases, hypertension, and many types of cancer. Within the diagnosis category of COPD, it is widely recognized that there is substantial phenotypic heterogeneity with respect to both pulmonary and extrapulmonary manifestations. To understand the variability in responses to CS, it becomes essential to decipher the involved mechanisms at a cellular and molecular level that contribute to cigarette-related pathology. In this issue of the Journal, there are three papers (1, 4, 6) that provide insight regarding the molecular pathogenesis of CS-related COPD that could be related to phenotypic variation, by examining three classes of cell types of lung: endothelial cells, epithelial cells, and immune effector cells.