"Semi-legal, highly dangerous way of causing crowd unrest."
— GTA Vice City Website.
In real life, Tear Gas is generally considered to be a non-lethal weapon, but in the world of GTA, it's anything but. Granted, it does take prolonged exposure to the gas to kill, but in confined spaces, this can be arranged. However, seeing as the gas causes people to stop what they are doing while they cover their face and cough, the most practical use for this weapon is to slow enemies down while the player is trying to escape or switch to another weapon and shoot them easily.
In Grand Theft Auto: Vice City, Grand Theft Auto: Liberty City Stories and in Grand Theft Auto: Vice City Stories, by deploying the Tear Gas too close to the player, he too, will lose health from the noxious gas, and the longer he stays there, the greater he loses his health, thus dying, much like other pedestrians. In Grand Theft Auto: San Andreas, Tear Gas can be used to attack pedestrians, while the player is unaffected and can freely walk around the gas, until the smoke subsides. Throwing a single can will last approximately 30 seconds, and by dropping more cans, the smoke will last longer and any pedestrians or cops who enter the smoke will be choke on the toxic gas until they die. However, using Tear Gas in a very populated area such as Ocean Beach or The Strip will give the player a high wanted level rather quickly and if the Tear Gas are used in succession, it may possibly award the player a six star wanted level.
The Tear Gas is not meant to be obtained in GTA Vice City (PC and Xbox versions), GTA Liberty City Stories and GTA Vice City Stories. However, the weapon is fully functional and can be obtained only by using trainers or modifications.
Grand Theft Auto: Vice City
Washington Beach - Behind the Washington Beach Police Station (original PS2 version only - grenade in other versions)
There is a glitch in GTA San Andreas involving the Tear Gas. After the Tear Gas is thrown into a crowd, the player can perform a stealth kill on any nearby people. Everyone affected by the gas will undergo the same animation and die at the same time. However there's a rare glitch that if the player performs this within the smoke will also die as if someone did stealth-kill to him which is really odd.
When you throw the tear gas at someone when they die, blood comes out like if they were killed with a gun or melee weapon.
Tear gas is one of the few weapons which cannot be spawned by cheats.
In GTA: San Andreas, casino security guards and enemy gang members during a gang war are immune to tear gas.