Did you know: Only one in 10 smokers can kick the habit. A startling 50 percent of people who have surgery for lung cancer recover and reach for the pack again. Why is it so hard to quit smoking? 

Did you know: Only one in 10 smokers can kick the habit. A startling 50 percent of people who have surgery for lung cancer recover and reach for the pack again.

Why is it so hard to quit smoking? 

Tags: smoking cigarettes biology cancer