Due to in the sense ‘because of’, as in he had to retire due to an injury, has been condemned as incorrect on the grounds that due is an adjective, and should therefore refer to a noun or pronoun, e.g. an illness due to old age. According to this view, it should not refer to a verb, such as retire in the first example above; owing to is often recommended as a better alternative. However, the use with a verb, first recorded at the end of the 19th century, is now common in all types of literature and is regarded as part of standard English.
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