Chunk #27 — Results — Longitudinal twin analysis — Substance-specific effects — Illicit drugs

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Sex differences and developmental stability in genetic and environmental influences on psychoactive substance consumption from early adolescence to young adulthood.

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Total genetic effects for illicit drug consumption decreased slightly from age 13–14 to age 16–17 (70% v. 63%) yet increased at age 19–20 (74%). In contrast to smoking and alcohol intoxication, common genetic effects increased consistently across the age groups whereas specific effects decreased by almost half from age 13–14 (50%) to ages 16–17 (25%) and 19–20 (31%).