Why is it so hard to quit smoking?

摘要

In England cigarette smoking is responsible for an estimated 81,700 deaths per year, in other words, 223 people a day - or nine people an hour - die from their smoking 'habit'. An estimated 36 per cent of all respiratory disease deaths, 29 per cent of cancer deaths and 14 per cent of all circulatory disease deaths are attributable to smoking. This figure rises to 87 per cent of deaths from chronic obstructive lung disease and 82 per cent of deaths from lung, bronchus and trachea cancer (NHS Information Centre: tinyurl.com/cym3apk).