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. Author manuscript; available in PMC: 2016 Apr 1.
Published in final edited form as: Drug Alcohol Depend. 2015 Jan 28;149:49–54. doi: 10.1016/j.drugalcdep.2015.01.016

Table 3.

Estimates of the total contributions of additive genetic, shared and unique environmental effects to cannabis, stimulant and sedative abuse and the proportion of each that is common versus substance class specific in its effect.

Substance class Additive genetic effects
Shared environmental effects
Unique environmental effects
Total % Common % Specific Total % Common % Specific Total % Common % Specific
Cannabis 0.70 76 24 0.18 100 0 0.12 72 28
Stimulants 0.64 92 8 0.20 100 0 0.16 60 40
Sedatives 0.64 84 16 0.18 100 0 0.18 48 52