Fact 1: Aging is associated with the death of cells.

Fact 2: Smoking accelerates the aging process.

Given the two facts above, answer the question "what does smoking accelerate?" with the following options: 
- Dehydration
 - Allergies
 - emissions
 - cell regeneration
 - decrease stamina
 - death of cells
 - lung capacity
 - aerobic ability


 

      death of cells   