The 'I Will Always Love You' singer still thinks about taking crack cocaine and marijuana – the substances she was addicted to when she was married to singer Bobby Brown - but turns to God when she feels tempted.

She told US TV host Oprah Winfrey in the second part of a tell-all interview: 'Don't think I don't have desires for it. It takes me a minute to cleanse. I have to pray it away.'

She added: 'I take things one day at a time. If I get weak, I know who I can turn to. I know God loves me."

Whitney did admit she still sometimes drinks alcohol, but is now completely free from drugs.

The 46-year-old star also revealed it was her faith that helped her finally make the decision to leave 40-year-old Bobby – who confessed he had cheated on his wife in his autobiography 'Bobby Brown: The Truth, the Whole Truth and Nothing But' – in 2006.

She told him she was going out 'for sugar and milk', but instead boarded a private jet from Atlanta to California, to make a fresh start.

At that time Whitney moved the couple's daughter, Bobbi Kristina, now 16, in with her brother and sister-in-law while she began to repair her life.

Whitney – who divorced Bobby in 2007 – said: 'My only concern was my daughter and her perception of her father. But the internet let her know things. She said, 'No. Divorce him. Let him go.