On tear gas, CDC has https://emergency.cdc.gov/agent/riotcontrol/factsheet.asp :
People exposed to riot control agents may experience some or all of the following symptoms
immediately after exposure:
* Eyes: excessive tearing, burning, blurred vision, redness
* Nose: runny nose, burning, swelling
* Mouth: burning, irritation, difficulty swallowing, drooling
* Lungs: chest tightness, coughing, choking sensation, noisy breathing (wheezing),
shortness of breath
* Skin: burns, rash
* Other: nausea and vomiting
Long-lasting exposure or exposure to a large dose of riot control agent, especially
in a closed setting, may cause severe effects such as the following:
* Blindness
* Glaucoma (a serious eye condition that can lead to blindness)
* Immediate death due to severe chemical burns to the throat and lungs
* Respiratory failure possibly resulting in death