Fact 1: Lung cancer is most often caused by exposure to tobacco smoke.

Fact 2: Lung cancer is the deadliest of all cancers.

Given the two facts above, answer the question "what results does exposure to tobacco smoke have?" with the following options: 
- a hazard
 - deadly
 - negative
 - alters hearing
 - neutral
 - kill them
 - harm
 - positive


 

  deadly       