A film showing the risks of cigarette smoking. The irritant and destructive effect of cigarette smoking on the throat and lungs is shown by diagrams and is dramatically illustrated by the breathless and distressed state of two people who have been heavy smokers. A 'smoking machine' demonstrates the amount of chemicals inhaled, including those which cause cancer; and an animated sequence shows the rise in the volume of cigarette smoking and in the number of deaths from lung cancer since 1910. Unglamorous aspects of smoking and its risk to health are contrasted with physical fitness.