In tech, the abuse of patents and the abundance of patent trolls has created a hostile environment for start-ups and innovators.

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"For someone at low genetic risk, being in a bad environment conveys only a modestly increased risk of drug abuse, " says lead study author Dr. Kenneth S. Kendler, professor of psychiatry and human genetics at Virginia Commonwealth University in Richmond.

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In addition, as far as the prenatal environment per hormonal influences, there is some evidence that sexual, physical or verbal abuse could be factors rising to the level of stress that might alter the hormonal prenatal environment, leading to problems in neurodevelopment.

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