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The study included 40 smokers of conventional cigarettes, 40 exclusive heat not burn cigarette users and 40 non-smokers with similar age and sex who were medical personnel in a university hospital

[2] According to the 2015 Global Adult Tobacco Survey (GATS) conducted under the auspices of the Philippines' Department of Health, Philippine Statistics Authority, the World Health Organization, and the United States Centers for Disease Control and Prevention, [3] 23.8 percent of the adult population were "current tobacco smokers"

You can spot these by looking for a blue sign bearing a white T (pictured)

Moreover, a potential limitation of this study is that all data were collected through self-reported questionnaires