Chunk #11 — 2. MATERIALS AND METHODS — 2.1 Participants — 2.1.1 MOAFTS

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The genetic relationship between cannabis and tobacco cigarette use in European- and African-American female twins and siblings.

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The MOAFTS protocol was approved by the Washington University School of Medicine Human Research Protections Office. All twins 18 years old or older gave informed consent prior to study participation.