Aktiva rökare en aning skyddade enligt denna mastodontstudie från UK. Största som genomförts så här långt enligt dem själva.
We found some evidence of increased
risks in former smokers. In
current smokers
there was a slight
protective effect, which
was removed when fully adjusted for
ethnicity. The risks
associated with
smoking have been disputed, with
increased risks initially reported, but some
more recent reports finding that smokers
are underrepresented in those with
more severe disease, and a potential protective
mechanism for nicotine has been
suggested
9,49: smoking prevalence was
lower than expected among hospitalised
patients in China, France and the USA.
https://www.medrxiv.org/content/10.1101/2020.05.06.20092999v1.full.pdf+html