Table 4.1 shows the number of different groups of people who died from bronchitis.

1. aWhat general pattern can be drawn from the table? [1]
2. bWhat effect does smoking have on the bronchioles? [2]
3. cSmokers usually suffer from shortness of breath. Suggest how this is brought about. [4]
4. dDescribe how cigarette smoking causes emphysema. [4]

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