Fact 1: Smoking causes direct damage to the lungs.

Fact 2: Smoking Cigarettes smoking is habit-forming.

Given the two facts above, answer the question "What do cigarettes cause?" with the following options: 
- circulatory systems
 - a lot of human deaths
 - increased health of lungs
 - increased stamina in life
 - Something that causes allergies
 - guaranteed longer life
 - harmful substances
 - direct damage to the lungs


 

        direct damage to the lungs 