In an interview with Oprah Winfrey in 2010, she said by the time The Preacher's Wife was released, '(doing drugs) was an everyday thing. ... I would do my work, but after I did my work, for a whole year or two, it was every day. ... I wasn't happy by that point in time. I was losing myself.'
In the interview, Houston blamed her rocky marriage to Brown, which included a charge of domestic abuse against Brown in 1993. They divorced in 2007.
Houston would go to rehab twice before she would declare herself drug-free to Winfrey in 2010.
~http://en.wikipedia.org/wiki/Whitney_Houston
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~http://www.dailymail.co.uk/tvshowbiz/article-2099990/Life-times-Whitney-Houston-Tragic-tale-American-singing-sensation-life-cut-short-age-48.html