Take a Deep Breath

Using real human lungs, Dr. Oz shows the havoc smoking can wreak. The healthy lungs of a nonsmoker, he says, look pink and supple. "It's not as pink as it usually is because it's been preserved," he says.

Dr. Oz contrasts the healthy lungs with the damaged lungs of a smoker. Dr. Oz says this lung's moth-eaten appearance is evidence of emphysema, which is a condition of chronic obstructive pulmonary disease, or COPD. He also points out a lump that denotes lung cancer.

"People keep thinking it's about cancer. Cancer's the tip of the iceberg," he says. "Emphysema and COPD is what people ought to wake up to as the big health risk for smoking."