Was Barack Obama really on crack before?

No, he did not. But in high school and during his first two years of college, like many students, he experimented with drugs, including marijuana and cocaine. There is no evidence he became a heavy user. He writes about this period of his life in his autobiography and is very honest about it. He has said he is not proud of that time in his life, but he learned from his mistakes. He was able to turn things around, focus on his education, and become successful in his life.