A review of the sciences.
"In people who smoke twenty cigarettes a day, one death in eight is due to lung cancer" (A Consultant Physician)
"Smoking and cancer link still not proved" (The Financial Times - on the day following the publication last month of the Tobacco Research Council's Report)
On the same day as this headline was written one tobacco company's shares rose by 1s. 6d. Why is there doubt in so many people's minds about the relationship between lung cancer and smoking? Is it a reasonable doubt? Or is it escapism? Tonight's programme examines the latest scientific evidence in detail.