there is a relationship between smoking cigarettes and getting emphysema Tobacco COPD: presenting the World Health Organization (WHO) Tobacco Knowledge Summary | Respiratory Research Leading Cause of Emphysema is

Researchers found that evidence regarding this outcome was weak after accounting for sources of uncertainty, while the relative risk factor was 2.66

Eur J Med Res 28 , 397 (2023)

However, research from the Institute of Medicine has shown that raising the legal age to 21 could significantly reduce addiction among young adults

Additionally, the KoGES integrated data are combined data of community-based, urban, and rural cohorts out of all KoGES cohorts and, thus, there could be discrepancies among the three cohort surveys

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