The Epidemiology refers to the analysis and the study of the determinants, distribution of the defined population’s health state and disease condition. It is the indicator of public health and helps in shaping up the policy decisions. In addition, it is the risk factor identification practice for the disease based on the evidence and the target of this practice is to provide preventive healthcare to the defined public. This study has been used at the global level to understand any kind of contemporary disease such as mental health, obesity, TB, Malaria, HIV/AIDS, cancer and so on. To understand this study, there is a research based on ‘cancer’ caused due to smoking and lung carcinoma, explained in the following paragraph.
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