It is a well-known fact that those who suffer from stress at work are often unskilled workers doing uninteresting, repetitive jobs, especially those on production lines. Many of them have already turned to medicines to fight against sleeplessness and fear about the future, two of the signs of long-term stress and depression. In Britain, people spend on million pounds a year on different kinds of medicines. About one-third of this is spent on those medicines dealing with stress and depression. People take three million sleeping tablets (药片) every night. Although these “drugs of mind” can be extremely useful in cases of crisis, most patients would be better off without them.

 There are many causes of stress: uninteresting work, unemployment, poor housing, family problems, over-crowding and financial worry are all important factors. Nevertheless, doctors believe that if people learnt to breathe properly, took more exercise, used their leisure time more actively and expressed their anger instead of holding it in, they would not depend so much on drugs, which treat only the outward signs and not the cause of the stress. If doctors refused prescriptions (处方) more often and discouraged patients with minor illnesses from visiting the doctors, the country would have more money to spend on improving leisure facilities and adult education, which are at present inadequate in many parts of the country. Moreover, doctors would have more time to spend on those patients in real need of their help.

The passage tells us that ____.