- Vesicants: These gases cause blisters on the skin and mucous membranes. Examples of vesicants include mustard gas and lewisite.

- Lung irritants: These gases cause irritation and inflammation of the lungs. Examples of lung irritants include chlorine gas and phosgene.

Other types of poison gases include:

- Nerve agents: These gases interfere with the function of the nervous system. Examples of nerve agents include VX gas and sarin gas.

- Blood agents: These gases interfere with the function of the blood. Examples of blood agents include hydrogen cyanide and carbon monoxide.

- Riot control agents: These gases are used to control crowds and riots. Examples of riot control agents include tear gas and pepper spray.