Over one billion dollars' worth of heroin each year -- that is the deadly fallout Pakistan gets from the blooming narcotics industry that provides the main cash crop in devastated Afghanistan. Locals in Pakistan say that heroin is cheaper than a healthy meal. The war in Afghanistan has seen opium poppy cultivation spiral and Karachi's port is a hub from which heroin is shipped around the world. Lucy Kafanov explores the deadly drug underbelly of the violent metropolis of more than 20 million people.

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