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A coronor has confirmed the toxology results.  The Houston family are happy for closure, but also very sad.

According the coronor reports, and Yahoo! "Whitney Houston was a chronic cocaine user who had the drug in her system when she drowned in a hotel bathtub, coroner's officials said Thursday after releasing autopsy findings that also noted heart disease contributed to her death.
Unfortunatly, this isn't necessarily surprising, but still very sad.