Coughs are often due to an infection such as cold or flu and sometimes
athsma. Many people who smoke develop a persistent cough. Sometimes
the cough can lead to production of phlegm. Hay fever is an allergic
reaction to pollens which also affects the upper respiratory tract.
A change of diet can be helpful for these problems there are also
many herbs that have soothing and anti-irritant affect on the upper
respitary tract.