Theobromine, a chemical found in large quantities in cocoa beans, suppresses cough by inhibiting activity of the vagus nerve which innervates the lungs from the brain.

• 咖啡碱是大量存在于可可豆中的一种化学成分，通过抑制大脑支配肺部的交感神经活性从而抑制咳嗽。