<b>Warning:<b> Contains footage of illegal drugs. Drugs are used in many situations, but how do we classify a drug? Life processes - Humans and other animals - Drug awareness Learning Points A drug is a chemical that affects how your body works. Medicines are legal drugs that should be taken carefully. Illegal drugs are dangerous to health and forbidden by law. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.