The trends were encouraging, and long-running, experts said, and distinguished young Americans from their parents’ generation, which had much higher rates of smoking and drinking. Just 9.6 percent of adolescents, ages 12 to 17, reported using alcohol in 2015, down from 17.6 percent in 2002, according to the data. Far fewer American adolescents smoke every day: about 20 percent in 2015, down from 32 percent in 2002.
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