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> the vast majority of US citizens have at least one comorbidity (obesity, diabetes, heart trouble, smoking, asthma, etc.)

If that's true (and I don't think it is) that's a serious problem.

BTW smoking is not a comorbidity, it's an habit that could or could not develop a comorbity given enough time.

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All substance abuse, including smoking, is a comorbidity[1]. While it's hard to find exact statistics, the US Department of Health and Social Services estimates that 50% of non-elderly Americans have a pre-existing condition[2]. Those conditions don't necessarily represent a comorbidity, but a nasty systemic infection like Covid-19 leaves little space for non-overlap.

1: https://en.wikipedia.org/wiki/Comorbidity

2: https://www.cms.gov/CCIIO/Resources/Forms-Reports-and-Other-...

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