Results showed that a large number of patients continued to smoke even after the diagnosis of COPD and lung cancer; whereas only a few among them used smoking cessation agents. Ethnicity disparities and insurance status were associated with the use of smoking cessation agents. Differential use among population sub-groups suggests a requirement for need based smoking cessation programs and appropriate prescription drug coverage. Further research needs to be done to evaluate reasons for disparities in smoking cessation agents' use. The study had limitations common to research designs based on observational and self-reported datasets.

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