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so Japanese people would live even longer than everyone else than they already do if they didn't drink so much

Japanese people don't drink a lot. They're 17th out of the 17 "high income countries" shown by default here:

https://ourworldindata.org/alcohol-consumption

They do smoke like chimneys though, which makes for some pretty surprising stats vis-a-vis lung cancer (lower rates than the US) and life expectancy (significantly higher).

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