New meta-analysis of 18 studies finds that smokers are *82% less likely* to be hospitalised with COVID-19 than nonsmokers.https://www.mdpi.com/1660-4601/17/20/7394/htm …
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Could you explain?
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Just...wow. They took a single estimate of how many smokers they expected to see based on a decade-old sample and then just assumed this applied to all places. No correction for age, no analysis of confoundingpic.twitter.com/RiUFFnHPW7
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No consideration of reporting bias (they used medical codes to capture smoking status in most studies, which can miss people!)
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I haven’t looked up their references, but I would hope the studies adjust for age like the ones I list here - https://velvetgloveironfist.blogspot.com/2020/06/smoking-and-covid-19-update-plus.html …
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Nope, they explicitly say that they could not adjust for age and instead used mean values due to the heterogeneity of study designpic.twitter.com/zjzmp4IJ6J
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Respect. But of 211 studies worldwide, involving at least 1,000 people, ~95% of those that distinguish current & former smokers find current smokers underrepresented based on nat'l smoking rates. I admire your caution. But if this was coffee, it'd be screaming headline news.
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Reminds me of when the coffee industry got threatened by people turning to and drinking green tea for Health. Yes more caffeine in tea By Pound. But a pound of tea is Huge compared to coffee. Misdirection. As is how caffeine is actually removed from coffee and tea.
End of conversation
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When considering survivorship bias as a potential confounder, it is important to know how smoking kills people. Yes, cancer, heart and lung disease. But it's neither a certain nor an instant death sentence. Smoking shortens the lives of 50% of lifelong smokers by 10 years.
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