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Proportion of variance positive and negative subjective initial reactions to cannabis and tobacco in European-American female twins attributable to additive genetic and non-shared environmental factors.
| Tobacco | Cannabis | |||
|---|---|---|---|---|
| Additive genetic | Positive | Negative | Positive | Negative |
| 0.34 [0.27–0.40] | 0.33 [0.26–0.39] | 0.35 [0.29–0.40] | 0.27 [0.20–0.36] | |
| Non-shared environment |
0.66 [0.60–0.73] | 0.67[0.61–0.74] | 0.65[0.60–0.71] | 0.72 [0.64–0.80] |
