В США, вроде, курит около 13%. Вот тут пишут, что чуть больше процента пациентов в США - курильщики. "Instead, these consistent observations, which are further emphasized by the low prevalence of current smoking among COVID-19 patients in the US (1.3%), raises the hypothesis that nicotine may have beneficial effects on COVID-19." https://www.qeios.com/read/article/561
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Re: 18. Возможно, дело в сопутствующих факторах (напр. кур
Вот тут пишут, что чуть больше процента пациентов в США - курильщики. "Instead, these consistent observations, which are further emphasized by the low prevalence of current smoking among COVID-19 patients in the US (1.3%), raises the hypothesis that nicotine may have beneficial effects on COVID-19."
https://www.qeios.com/read/article/561