This Brookhaven National Laboratory (BNL) Web site contains a press release about the recent findings from BNL scientists that smoking reduces levels of a critical enzyme (MAO B) not only in the brain, but in the peripheral organs as well (kidneys, heart, lungs, and spleen). The press release includes images of whole body PET scans showing the distribution of the radiolabeled enzyme in the bodies of a smoker and a nonsmoker -- users can click on the image for a high-resolution version.