1.   Cigarette smoking is the single most important cause of lung cancer.

2.   Crime is a complex social phenomenon with no single cause or solution.

3.   Crime is a complex social problem with no single cause or solution.

4.   In so doing, they probably constituted the most important single cause of the subsequent civil war and revolution.

5.   Money is the single biggest cause of discord in Marriage.

6.   The most common single cause was aircrew error.

7.   Chronic dietary insufficiency is thought to be the single main cause but the mechanism is unclear.

8.   Despite the devastation which could be caused in peace-time, Gregory saw civil wars as being the single most important cause of disruption.

9.   But it is still the largest single cause of death in babies aged over one week, according to the Foundation for the Study of Infant Deaths.