Different poisons enter the human body in different ways. Poisons mainly enter the human body through oral intake, respiratory inhalation and skin mucous membrane absorption, leading to human poisoning. Oral poisoning is very common, such as people who cannot think or are impulsive and take an overdose of sleeping pills or pesticides, or are poisoned by others in food or water, and accidentally take poisonous mushrooms, etc. Gaseous toxins, such as gas (carbon monoxide), are mainly inhaled into the lungs through the respiratory tract. During factory production, poisons can also be inhaled through the respiratory tract in the form of dust, fumes, and vapors. Some poisons, such as organophosphorus pesticides and paraquat, can also be absorbed through the intact skin mucosa when spilled directly on the body or clothes. In addition, when bitten or stung by animals such as insects and snakes, toxins can enter the body through wounds. The same poison can enter the human body through different ways, such as organophosphorus and paraquat, which can be poisoned orally, or absorbed through skin mucous membrane after contamination.