This article is from the alt.usage.english FAQ, by Mark Israel misrael@scripps.edu with numerous contributions by others.
"Due to" meaning "caused by" is undisputedly correct in contexts
where "due" can be construed as an adjective (e.g., "failure due to
carelessness"). Its use in contexts where "due" is an adverb
("He failed due to carelessness") has been disputed. Fowler says
that ""due to" is often used by the illiterate as though it had
passed, like "owing to", into a mere compound preposition". But
Fowler was writing in 1926; what hadn't happened then may well
have happened by now.
 
Continue to: