In the early stages, drug use is often hard to see.

早期，吸毒往往很少见。

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It's also hard to find much right with a drug that elevates blood pressure, aggravates stress, causes insomnia and leads to addiction.

同样，另一种药会导致血压升高、加剧紧张、造成失眠，而且最终会上瘾，你就很难说它有什么好处。

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It's hard to find much wrong with a drug that can battle fatigue and improve creativity and could even help prevent Parkinson's disease and diabetes.

如果一种药可以对抗肥胖，提高创造性，甚至还能有助于防止帕金森症和糖尿病，你很难说它有什么不好。

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It's hard to catch drug traffickers in Mexico,Cuellar says, and once they are caught "...to prosecute someone, at least when I was down there, was less than a 2 percent chance."

VOA: standard.2010.07.20

Cocaine, Britain's favourite hard drug, manufactured by peasants in a war zone, marketed by celebrities in nightclubs.

BBC: Transcript: Cocaine: Alex James in Colombia

He said the findings would impact on drug policies, because they suggested reducing or eliminating the availability of cannabis would be "unlikely to make a dent" in the hard drug problem.

BBC: Cannabis 'not linked to harder drugs'

Although casual hard-drug consumption may be dropping, the number of hard-core hard drug users those most directly associated with the private and collective misery of drugs has scarcely budged since the war began.

ECONOMIST: Ending the war on drugs