To the ham-lovers of Smithfield, Virginia, it isAmerican weaknessthat explains why Chinese tycoons may soon own the giant pork producer that dominates their home town. Local hams, made from peanut-fed pigs and then hickory-smoked, first earned fame in colonial times. In Smithfield images of hogs vie with American flags as a badge of pride, adorning shopfronts, school sports kit and