You are presented with the question "what causes lung cancer?" and the following answer choices: 
- Pollution
 - smoking salmon
 - burning
 - cigarettes
 - gasoline
 - lung tissue
 - heating liquids
 - respiration

Now knowing that lung cancer is most often caused by exposure to tobacco smoke and tobacco is smoked in pipes or in cigarettes or bidis, choose the best answer.


 

    cigarettes     