<b>Warning:</b> Contains footage of smoking. Why do so many people smoke when the risk to their health is so high? Life processes - Humans and other animals - Drug awareness Learning Points Smoking damages health. Smoking increases the chances of cancer and leaves tar in the lungs. Cigarettes contain the addictive substance nicotine. A Twig Context Film. Reinforce and extend the learning required by the curriculum. Twig’s context films show abstract concepts in action in the real world.