An increase in some cancers and bronchitis may reflect changing smoking habits and poorer air quality, say the researchers.

研究人员说，患癌症和支气管炎的人数的增加可能反映了吸烟习惯的改变和空气质量的下降。

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The report proposed a 20-year plan to bring out a gradual change in smoking habits.

报告提出了一个渐进改变吸烟习惯的20年计划。

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The results held good even after taking into account age, overweight and smoking habits.

即使考虑到年龄，超重以及抽烟习惯等差异，这个调查结果仍然是有效的。

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The JAMA research looked at the smoking habits and heart health of more than 3, 000 people between 1981 and 2011.

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If twins had similar rates of cancer, despite differences in smoking habits, it would have suggested that smoking wasn't carcinogenic.

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Dr Kandel and Dr Udry, both sociologists, investigated the smoking habits of around 220 pairs of mothers and their adolescent daughters.

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