The dependent variables were measured by five indicators, including the lifetime use of tobacco, alcohol, marijuana, all other illicit drugs (including cocaine, inhalants, opiates, amphetamine, sedative hypnotics, hallucinogens, steroids, and homemade brews), and use of 2 or more illicit substances (“polyuse”). According to the literature, these substances are the most common substances preferred by Turkish adolescents.
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