Introduction
Smoking was first implicated in the 1950s as a risk factor for lung cancer.' Since then it has been linked with cardiovascular disease and cancers of the mouth, trachea, oesophagus, and digestive tract.' As a result a wide range of health education programmes aimed at reducing smoking have arisen,3 but although there have been some declines in the prevalence of smoking in certain Western countries-related apparently to various event sand campaigns4 so far there has been litle cause for optimism.