doctors prescribing cigarettes TIL From 1927 to 1952, Tobacco Companies used pictures of in their advertising and used slogans claiming that doctors endorsed their brand. : r/todayilearned Wait til you see some

The quality varies

The meta-analytic tool overcomes many of the limitations of traditional meta-analyses by incorporating between-study heterogeneity into the uncertainty of risk estimates, accounting for small numbers of studies, relaxing the assumption of log(linearity) applied to the risk functions, handling differences in exposure ranges between comparison groups, and systematically testing and adjusting for bias due to study designs and characteristics

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According to their calculations, inhaling 22 micrograms of PM2.5 per cubic meter for 24 hours gives you the same pollution exposure as smoking one cigarette