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Fumer nuit à la santé.
Smoking harms health.
to harm or damage someone or something, with à
Ce bruit nuit à mon travail.
This noise harms my work.
Le tabac nuit gravement à la santé.
Tobacco seriously harms health.
to be detrimental to a reputation or interest
Ce scandale pourrait nuire au ministre.
This scandal could harm the minister.
From Latin nocere.