WITH an ex-husband like Bobby Brown, Whitney Houston doesn’t need enemies.

In his upcoming autobiography, Brown blows the lid on his wildly dysfunctional marriage to the troubled, Grammy-winning diva, suggesting that she drove him into a nightmare of drug addiction.

“I never used cocaine until after I met Whitney. Before then, I had experimented with other drugs, but marijuana was my drug of choice,” Brown writes in “Bobby Brown: The Truth, the Whole Truth and Nothing But,” out next month. “At one ...