These studies can be very misleading, because “people who don’t drink” often includes alcoholics:https://twitter.com/DegenRolf/status/882666998567546880 …
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Zhao et al seem to doubt that these confounding factors have been properly controlled for. http://www.jsad.com/doi/10.15288/jsad.2017.78.375 …
All we know about the HARMFUL effects of smoking is based on the same kinds of methods and data. Doubting those too?
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