Toxic substances refer to chemicals or biological agents that can cause harm or adverse effects to living organisms, including humans. These substances are typically poisonous, corrosive, flammable, or can lead to illness, injury, or even death upon exposure or ingestion. Examples of toxic substances include heavy metals (such as lead, mercury, and arsenic), pesticides, industrial chemicals (like benzene and asbestos), certain drugs or pharmaceuticals, toxic gases (such as carbon monoxide), and naturally occurring toxins produced by organisms (like certain fungi or bacteria). The degree of toxicity can vary, ranging from mildly toxic substances that may cause irritation or allergic reactions to highly toxic substances that can cause severe poisoning or long-term health effects.
