Chunk #17 — 2. MATERIALS AND METHODS — 2.2 Procedure and Assessment Battery for MOAFTS and MOFAM — Lifetime Cannabis use

Source

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

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yes

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Participants who responded “Yes” to the question “Have you ever used marijuana?” at any wave of data collection were classified as positive for use.