Fact 1: Smoking causes direct damage to the lungs.

Fact 2: Cigar smoking is on the rise.

Given the two facts above, answer the question "what causes direct damage to the lungs?" with the following options: 
- breathing
 - oxygen
 - influenza
 - parasites
 - cigars
 - germs
 - steroids
 - respiring


 

     cigars    