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Chunk #6 — MATERIALS AND METHODS — Measures — Regular substance involvement (RSI)

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Peer substance involvement modifies genetic influences on regular substance involvement in young women.
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Repeated cannabis use was defined as a lifetime history of using cannabis 11 or more times and endorsed by 18% of the sample. There is currently no standardized measure of ‘regular’ cannabis use, however those using cannabis less frequently are assumed to not be at risk for dependence.