The popular leader, who has been trying to kick the habit completely, made the revelation at a White House news conference in between talks on health care reform, a new energy policy and a halt to Iranian repression of dissent.
"As a former smoker, I constantly struggle with it," the New York Daily News quoted him as saying.
He added: "Have I fallen off the wagon sometimes? Yes. Am I a daily smoker, a constant smoker? No."
Obama, who inked the Family Smoking Prevention and Tobacco Control Act, insisted that he made it a point not to give in to his 'weak moments' in front of his family.
He said: "I don't do it in front of my kids. I don't do it in front of my family. I would say that I am 95 percent cured. But there are times ... where I mess up." "