Scientists recorded the percentage of adults who smoke and the number of new cases of lung cancer per 100 000 people in four countries. The table shows their results.
Table: The percentage of adults who smoke and the number of new cases of lung cancer per 100 000 people in four countries
| Country | Adults who smoke (%) | New cases of lung cancer per 100 000 people |
|---|---|---|
| W | 8 | 14 |
| X | 15 | 26 |
| Y | 22 | 38 |
| Z | 30 | 55 |
Which conclusion is supported by the data in the table?
Smoking causes lung cancer in almost every adult who smokes
Countries with a higher percentage of smokers have more cases
Every adult who develops lung cancer in country Z is a smoker
Halving the percentage of smokers would halve the new cases
179 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.