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An unidentified 15-year-old girl, who said she has been smoking since she was 13, smokes a cigarette during lunch break in front of her high school in Brookline, Mass., Monday, Sept. 11, 2000. A new study of 681 students in central Massachusetts adds to mounting evidence that nicotine addiction is more powerful in teen-agers than adults. The girl said that she has tried to quit eight times. (AP Photo/Angela Rowlings)