The American Cancer Society is asking the U.S. Surgeon General for a detailed study of the health impact of sugary drinks. The group wants a study on the level of a landmark report on the dangers of smoking that was done in the 1960's. Sugar-sweetened drinks like soda, sport drinks, flavored teas and juices are under new scrutiny because of a New York City plan to limit cup sizes to 16-ounces. More than two-thirds of Americans are overweight or obese. Poor diet and a lack of exercise are common reasons given for the epidemic, but there is an increasing amount of attention on sugary drinks as another factor.