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Due to various constraints like technical, ethical, or financial considerations, researchers often rely on observational studies in public health

A medical professional (who should be wearing gloves!) can monitor any antibiotics an infected person is currently taking and might suggest probiotics

Unless more effective measures are implemented to combat the tobacco epidemic, it is projected to result in over 1 billion deaths in this century.1 South Korea has historically recorded a high prevalence of smoking and cigarette consumption

Tissue pigmentation increases with tobacco use and is more common in women than men

[Google Scholar] 8.World Health Organization