Usage Note: Due to has been widely used for many years as a compound preposition like owing to, but some critics have insisted that due should be used only as an adjective. According to this view, it is incorrect to say The concert was canceled due to the rain, but acceptable to say The cancellation of the concert was due to the rain, where due continues to function as an adjective modifying cancellation. Although there is still some support for this notion among members of the Usage Panel, the tide has turned toward accepting due to as a full-fledged preposition. Back in 1966, the "adverbial" use of due to (as in was canceled due to the rain) was rejected by 84 percent of the Panel. In our 2001 survey, however, 60 percent accepted this construction. There is no linguistic reason to avoid using due to as a preposition, but English has a variety of ready substitutes, including because of, on account of, and owing to.
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