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Bo-Qi Liu a Department of Epidemiology, National Cancer
Institute, Chinese Academy of Medical Sciences, Panjiayuan, Chaoyang
District, Beijing 100021, People's Republic of China, b Clinical Trial
Service Unit and Epidemiological Studies Unit, Nuffield Department of
Clinical Medicine, Radcliffe Infirmary, Oxford OX2 6HE, c Division of Nutritional
Sciences, Cornell University, Ithaca, NY 14853, USA, d Institute of Nutrition and Food
Hygiene, Chinese Academy of Preventive Medicine, Beijing 100050, People's Republic of China
Correspondence to: Professor Liu or Professor Peto
gale.mead{at}ctsu.ox.ac.uk
Objective:
To assess the hazards at an early phase of the growing epidemic of deaths from tobacco in China.
Design:
Smoking habits before 1980 (obtained from family or other informants) of 0.7 million adults who had died of
neoplastic, respiratory, or vascular causes were compared with those of
a reference group of 0.2 million who had died of other causes.
Setting:
24 urban and 74 rural areas of China.
Subjects:
One million people who had died during
1986-8 and whose families could be interviewed.
Main outcome measures:
Tobacco attributable mortality
in middle or old age from neoplastic, respiratory, or vascular disease.
Results:
Among male smokers aged 35-69 there was a 51% (SE 2) excess of neoplastic deaths, a 31% (2) excess of
respiratory deaths, and a 15% (2) excess of vascular deaths. All three
excesses were significant (P<0.0001). Among male smokers aged
70
there was a 39% (3) excess of neoplastic deaths, a 54% (2) excess of respiratory deaths, and a 6% (2) excess of vascular deaths. Fewer women smoked, but those who did had tobacco attributable risks of lung
cancer and respiratory disease about the same as men. For both sexes,
the lung cancer rates at ages 35-69 were about three times as great in
smokers as in non-smokers, but because the rates among non-smokers in
different parts of China varied widely the absolute excesses of lung
cancer in smokers also varied. Of all deaths attributed to tobacco,
45% were due to chronic obstructive pulmonary disease and 15% to lung
cancer; oesophageal cancer, stomach cancer, liver cancer, tuberculosis,
stroke, and ischaemic heart disease each caused 5-8%. Tobacco caused
about 0.6 million Chinese deaths in 1990 (0.5 million men). This will
rise to 0.8 million in 2000 (0.4 million at ages 35-69) or to more if
the tobacco attributed fractions increase.
Conclusions:
At current age specific death rates in
smokers and non-smokers one in four smokers would be killed by tobacco, but as the epidemic grows this proportion will roughly double. If
current smoking uptake rates persist in China (where about two thirds
of men but few women become smokers) tobacco will kill about 100 million of the 0.3 billion males now aged 0-29, with half these deaths
in middle age and half in old age.
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