Chunk #23 — RESULTS — Genetically informative research approaches and their limitations — Comorbidity between use of different substances

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Genetically informative research on adolescent substance use: methods, findings, and challenges.

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Finally, it is noteworthy that illicit drugs themselves share genetic influences to a considerable extent. One study of an adult sample reported that a single genetic factor was responsible for nearly all of the heritable influences on illicit substance use – the exception was opiate and sedative use, for which 70% and 50% of the genetic influences, respectively, were drug specific.54