A new report presented at yesterday's meeting of the Pediatric Academic Societies in Baltimore reveals that a child's exposure to secondhand smoke may lead to substandard test scores. The study, conducted by researchers at Cincinnati Children's Hospital Medical Center, examined over 4,000 children using tobacco data collected from 1988 to 1994. Children who had higher levels of the nicotine byproduct cotinine in their system tested lower on math, reading, reasoning and logic tests. The largest declines were seen in reading levels. According to the study, over 13 million children are exposed to high levels of secondhand smoke each day.