I would say they are used pretty much interchangeably, except that you wouldn't start a sentence with 'because of' because it doesn't sound too good. However, starting a sentence with 'due to' is perfectly fine. eg because of his meddling, i was unable to get laid (sounds fine spoken but doesn't look as good written) -> i was unable to get laid because of his meddling (works either way) eg1. due to his interference, i missed my chance/i missed my chance due to his interference. (works either way in any form)

"Due to" is an adjective. "Because of" is an adverb. Tips: "due to" is always used after a form of the verb to be, "because of" isn't. Hope it helps!