Smoking causes direct damage to the lungs, and smoking Cigarettes smoking is habit-forming. Given these facts, what do cigarettes cause among 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 