Dr Alice deploys some shock tactics to make one confirmed smoker realize just how much she's damaging her lungs. Lisa Garrity's will power lets her down and on a night in the pub, she can easily binge smoke her way through 40 cigarettes. She meets up with Dr Alice in the lab to dissect a pair of lungs while outside in the real world they come face to face with a cancerous lung tumor cut out of 56-year-old Christine, a lifelong smoker. Will it be enough to convince Lisa to quit? Meanwhile, Dr Alice is testing her own lungs to the max - measuring their function while she suffers an asthma attack triggered by her own allergy to dust mites. She also wants to know if her own form of exercise, cycling, may be doing her more harm than good if she travels through a traffic clogged city. Plus she finds out which vitamin packed foods make up a tasty meal which can help keep the lungs - and all the organs in the body - working at peak performance.