PROF. ZHENG YANGWEN:'By the 1820s, opium addiction became visible socially.' Which means opium dens on the street, people dying off, dozing off on the street, it's becoming a social problem.

The Taliban claims opium poppy cultivation was stopped and the flow of illegal drugs halted when it was last in power in Afghanistan. But although there was a sharp drop in 2001 - when it was last ...