Figure 1.

Six cigarette warning labels. Label A was the old Chinese warning label, with 'smoking is harmful to your health' in Chinese on one of the side panels of the pack. Label B was the new Chinese warning label, with 'smoking is harmful to your health', and 'quit smoking reduces health risk' on the front and back faces of the package, in Chinese and English respectively. Label C was a famous Chinese brand exported abroad, with text, pictorials, and quitline on the whole front face and 1/3 back face, respectively. The text said 'smoking damages your blood vessels, which can prevent blood circulation, particularly to your legs or feet. This can result in blood clots, infection, gangrene, even amputation.' The other labels were foreign brands. Label D warned that cigarette smoking can result in mouth and oropharynx cancers in text and pictures on 50% of cigarette package. Label E showed smoking when pregnant harms your baby in large area with text and pictures. Label F indicated that smoking can lead to laryngeal cancer in text and pictorial on 50% of cigarette package.