It is wrecking the government of Mexico. It is financing the Taliban in Afghanistan. It is throwing 11,000 Britons into jail. It is corrupting democracy throughout Latin America. It is devastating the ghettoes of America and propagating Aids in urban Europe. Its turnover is some £200bn a year, on which it pays not a penny of tax. Thousands round the world die of it and millions are impoverished. It is the biggest man-made blight on the face of the earth.