Chunk #10 — Introduction — The current study

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The CHRNA5/A3/B4 gene cluster and tobacco, alcohol, cannabis, inhalants and other substance use initiation: replication and new findings using mixture analyses.

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Data were used from the genetic pairs subsample of the National Longitudinal Study of Adolescent Health (Add Health), which is a longitudinal study of a nationally representative sample of adolescents in the United States (Harris 2009).