There are four main ways that a harmful chemical can enter your body. Inhalation – Some chemicals are in the form of gas and vapors, while others give off strong fumes and odor. The tiny chemicals in the air enter your nose and get deposited in your lungs. Ingestion – Chemicals are sometimes swallowed or ingested accidentally. They also get into your mouth if mishandled. The harmful liquid goes into your stomach then to your liver before entering the bloodstream. Absorption – Hazardous chemicals can get deposited on your skin or the eye, where they get absorbed before joining your blood circulation. Injection – Sharp objects contaminated by hazardous chemicals can puncture your skin, transporting harmful chemicals into the body.