By REUTERS
NEW YORK - US high school students are unlikely to be heavy smokers, but casual and occasional smoking is on the rise, according to a new study that warns even light smoking poses health risks.Researchers found that occasional smoking among teens rose from 67.2 percent in 1991 to 79.4 percent in 2009, while heavy smoking fell from 18 percent to 7.8 percent."We're seeing a broad national phenomenon," said Dr. Terry Pechachek, a study co-author from the Centers for Disease Control."With fewer cigarettes, the price effect, smoke-free policies and a change in the broad public awareness of risk, the heaviest patterns of use are becoming very rare," Pechachek said.
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