Powerful Medicine: The Chinese government says that refraining from spitting makes one invincible:

SPITTING ON THE GROUND IS DANGEROUS TO YOUR HEALTH, AND SPIT CONTAINS INFECTIOUS DISEASES. BUT WITH ONE SMALL BAG IN YOUR HANDS, YOUR HEALTH WILL ALWAYS BE INVINCIBLE. - Printed on white spit bags handed out on the streets of China. The government's latest battle in the war against SARS is curbing the national habit of spitting.