Michael Houston admitted on Oprah's Next Chapter that he was the first one to do drugs with the late Whitney Houston.

He and his little sister would always do things together growing up, with Whitney following behind him. So when it came to drugs, they did that together too. He said he didn't realize, back in the '80s, that the drugs they were doing were so dangerous. "You gotta understand, at the time .... it was acceptable," he said in an interview clip on TMZ.  

Since he introduced his sister to things like crack cocaine, he feels guilty for her drug-fueled end. "I feel responsible for what I let go so far. ... It just got out of hand.”

Watch Michael, and their mother Cissy, talk to Oprah in this tearful preview video.

Source: TMZ