Poisons are substances that can cause harm or death when they enter the body. They can be found in various forms, such as liquids, solids, or gases, and can affect different systems in the body. Common examples of poisons include carbon monoxide, arsenic, and certain plants like poison ivy. The effects of poisons depend on the type and amount ingested or absorbed. Symptoms can range from mild reactions, like nausea, to severe consequences, such as organ failure. Understanding how poisons work is essential for prevention and treatment, especially in cases of accidental exposure or poisoning.