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Scientific papers suggesting that smokers are less likely to fall ill with covid-19 are being discredited as links to the tobacco industry, reveals an investigation by The BMJ today.

Journalists Stéphane Horel and Ties Keyzer report on undisclosed financial links between certain scientific authors and the tobacco and e-cigarette industry in a number of covid research papers.

In April 2020, two French studies (shared as preprints before formal peer review) suggested that nicotine might have a protective effect against covid-19 - dubbed the "nicotine hypothesis."