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As women took up smoking later than men, the full impact of smoking on their health has yet to be seen. But it is clear from countries where women have smoked longest, such as the United Kingdom and the United States, that smoking causes the same diseases in women as in men and the gap between their death rates is narrowing. On current trends, some 20 to 25 per cent of women who smoke will die from their habit. One in three of these deaths will be among women under 65 year of age. The US Surgeon General has estimated that, amongst these women, smoking is responsible for around 40 per cent heart disease deaths, 55 per cent of lethal strokes and, among women of all ages, 80 per cent of lung cancer deaths and 30 per cent of all cancer deaths. Over the last 20 years, death rates in women from lung cancer have more than doubled in Japan, Norway, Poland, Sweden and the United Kingdom; have increased by more than 200 per cent in Australia, Denmark and New Zealand; and have increased by more than 300 per cent in Canada and the United States. 21. The effect of smoking on women has not been paid enough attention because______. A. men suffer more from smoking B. men would like women to smoke C. men are considered the main sufferers of smoking D. there are alarming statistics of death caused by smoking 22. This is no longer the case.The word this refers to______. | 
