Global addiction |
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| Heroin is one of the most powerful of all addictive substances. Much heroin - and its parent drug, opium - comes from Afghanistan, and makes its way to profitable western markets via Iran, where, as a result, both drugs are readily available. As the BBC's Philip Fiske reports from Iran, more than a million of the country's sixty million people are regular users. |
| The drugs trade | |
| Drugs: A global business |