The mayor made the confession under direct questioning by a councillor who has introduced a motion that would ask Ford to take a leave of absence and get help for his admitted drug use.
Ford publicly admitted last week that he smoked crack cocaine last year in a "drunken stupor," but his comments today marked the first time he acknowledged having bought illegal drugs.
Then Ford replied, "Yes I have."
"I understand the embarrassment that I have caused. I am humiliated by it," Ford said.
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But he then turned defiant, saying he was not an addict of any sort and rebuffed suggestions from council members that he should seek help. He insisted he is a "positive role model for kids who are down and out."
"I'm most definitely keeping this job," he said. "I am not leaving here. I'm going to sit here and going to attend every meeting."
Although it was a stark demonstration of his political isolation, the vote was symbolic because the City Council does not have the authority to force the mayor from office unless he is convicted of a crime.
"Together we stand to ask you to step aside and take a leave of absence," Councillor Jaye Robinson said, reading the open letter.
The packed council chamber erupted with applause when Robinson ended her speech, saying "Let's get on with city business."