Tear gas is a chemical agent commonly used for crowd control and self-defense. It causes temporary irritation to the eyes, skin, and respiratory system, leading to tearing, coughing, and difficulty breathing. The primary compounds in tear gas include CS gas and CN gas, which are designed to disperse crowds and incapacitate individuals without causing permanent harm. While tear gas is often deployed by law enforcement during protests or riots, its use is controversial. Critics argue that it can lead to severe health issues, especially for vulnerable populations, such as those with respiratory conditions. Additionally, its deployment can escalate tensions in already volatile situations.