A poison is a substance that has toxic effects and may injure you or make you sick if you are exposed to it. Poisons can be found everywhere, from simple household cleaners to cosmetics to houseplants to industrial chemicals. Even medicines that are taken in the wrong dose, at the wrong time, or by the wrong person can cause a toxic effect. Poisonous substances can hurt you if they are swallowed, inhaled, spilled on your skin, or splashed in your eyes. In most cases, any product that gives off fumes or is an aerosol that can be inhaled should be considered a possible poison. More than 90% of poisonings occur in the home. Learn more about poisoning control at kp.org.