Poisons are substances that produce harmful effects on the cells of the body.
Poisons can be swallowed, inhaled, absorbed or injected. Most cases of poisoning are accidental and involve children or the elderly. However, in some instances, poisoning can be deliberate, when a person attempts to commit suicide or to harm someone else. In all of these instances, appropriate first aid will minimise the harm to the individual who is poisoned. Some interfere with the blood s ability to carry oxygen, while others burn and irritate the digestive tract or respiratory system.