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PMID 14078362

This review does have some useful though equivocating text buried within it as the truth is essentially undeniable

Longitudinal studies should further help in understanding and evaluating use trends, sociodemographic characteristics, and health risks in various populations being exposed to/using hookah, which would ultimately shape new more strict policies, especially those governing use among highly vulnerable populations, including pregnant females and youth

I meant the first (which is more common in epidemiology), but if we want the second, its about 25 / 6, which is a little more than 4

Leaves harvested earlier tend to be lighter and milder