Scientists do know that having a mental illness doesn’t just increase the chance of intermittent drug abuse; it also significantly raises the risk of outright dependence and addiction.

科学家们确信，精神疾病不仅会增加患者间歇滥用药物的机率，而且还会增加彻底依赖药物甚至上瘾的风险。

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In fact, ketamine has shown promise at reducing the risk of suicide and is currently being tested in humans for effectiveness in treating bipolar disorder and addiction.

事实上，克他命在降低自杀风险方面前景看好，目前正在接受治疗人类躁狂症和成瘾的疗效试验。

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But precarious mental health is not the only risk for long-term addiction.

但精神异常并非长期上瘾的唯一风险。

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They added that further research could examine if decreased amygdala volume in cocaine addicts represents a marker for illness that could lead to the identification of genes that modify the risk for addiction.

BBC: Cocaine users were compared to non-users

At bottom, however, all have a healthy tolerance for risk, an addiction to change and challenge, and strong views on what matters most in life.

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Betty McBride, director of policy and communications at the British Heart Foundation, said thousands of children at risk of this "deadly addiction" regularly got tobacco from vending machines, "which conveniently don't ask them to prove their age".

BBC: Cigarette vending machines banned in England