Chunk #51 — Figure 2

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Recent advances in the genetic epidemiology and molecular genetics of substance use disorders.

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Parameter estimates for the contributions to variation in liability to psychoactive drug use of additive genetic effects (a2, red), familial environmental factors (c2, light blue) and the individual-specific environment (e2, dark blue) by year for average daily number of cigarettes, ages 13–40. Data from ref. 11.