Tear gas, also known as a lachrymator agent, is a chemical compound that temporarily makes people unable to function by causing irritation to the eyes, nose, mouth, and lungs. It is a pressurized powder that creates a mist when deployed, and the most commonly used form of tear gas is 2-chlorobenzalmalononitrile (CS gas) . Tear gas is often used by law enforcement agencies as a means of dispersing mobs, disabling rioters, and flushing out armed suspects without the use of deadly force. Tear gas exposure can cause chest tightness, coughing, a choking sensation, wheezing, and shortness of breath, in addition to a burning sensation in the eyes, mouth, and nose, blurred vision, and difficulty swallowing. Tear gas can also cause chemical burns, allergic reactions, and respiratory distress. People with preexisting respiratory conditions, such as asthma and chronic obstructive pulmonary disease (COPD), have a higher risk of developing severe symptoms of their disease that could lead to respiratory failure. Long-term health effects from tear gas are more likely if exposed for a prolonged period or to a high dose while in an enclosed area, which can lead to respiratory failure and death.