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A mainstay of health research today, these studies compare two cohorts of people: the cases, who all have a particular disease or condition, and the controls, who are as similar to the cases as possible but, crucially, dont have the disease

Smoking is notorious for being an established risk factor for various health conditions

Ethics declarations Ethics approval and consent to participate This research was approved by the Shahrekord University of Medical Sciences with the code of ethics IR.SKUMS.REC.1396.32

At the same time, the mayor posted an article titled Smoking prohibited in front of stations in government-designated cities to the Shizuoka Shimbun