Barack Obama's doctor said he's "in excellent health," in a one-page letter released by the campaign Thursday.

The Democratic presidential candidate's vice: He's a smoker who has quit, unsuccessfully, on several occasions -- but is currently trying again, with Nicorette gum, "with success," wrote Dr. David T. Scheiner, a Chicago internist.

Obama, 46, is a regular jogger "with no excess body fat," Scheiner wrote. His last checkup over a year ago found excellent blood pressure and cholesterol levels, no signs of heart problems on an EKG, and a healthy prostate, the letter concluded.

Scheiner has been Obama's primary care doctor since 1987, and said he was summarizing 21 years of medical records in five paragraphs.