Acupuncture cannot rebuild lung tissue, but by opening up the breathing tubes it can allow the remaining lung tissue to function efficiently. The mechanism of acupuncture in bronchitis is probably much the same as in asthma, allowing more air to enter the lungs. Recent Chinese work has shown that about 50 per cent of bronchitics 'benefit' from acupuncture. The treatment must be repeated regularly if the effect is to be maintained.