Teen-agers from families of high social status smoke less than those from families of low social status, according to a Harvard study. For the university's school of public health, Drs. Eva J. Salber and Brian MacMahon surveyed the senior high school in Newton, Mass., which they chose because the social cross section is similar to much of the urban U.S. To get serious and responsible answers, the researchers got the questionnaires filled out during school hours and required students to sign them, promising that neither parents nor teachers would ever learn what was...
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