Smoke Grenade

Smoke Grenades are used in the Call of Duty series as signaling devices, target or landing zone marking devices, and concealment devices. The body is a sheet-steel cylinder with emission holes in the top and bottom. These allow the smoke to be released when the grenade is ignited. The M18 colored smoke grenade is used in Call of Duty: United Offensive and the M83 white smoke grenade is used in Call of Duty 4: Modern Warfare, Call of Duty: Modern Warfare 2, and Call of Duty: Modern Warfare 3, but does not appear in Call of Duty: Black Ops, having been replaced by the Willy Pete.

Call of Duty: United Offensive
In Call of Duty: United Offensive, the smoke grenade is only available in multiplayer. It is available to all teams, and keeps the same appearance as the M18 smoke grenade regardless of team. There is a 3 second delay after throwing the smoke grenade before it deploys its smoke, which stays in the air for approximately 30 seconds.

Call of Duty 2
In Call of Duty 2, the Smoke Grenade returns, and it takes a longer duration for the smoke to actually pour out of the grenade; about five seconds. They cannot be found in grenade bags but can rarely be found in a bunker or house.

Call of Duty 3
The smoke grenade in Call of Duty 3 is basically the same as it is in the previous installments.

Call of Duty 4: Modern Warfare
"Device that creates a smoke screen when detonated."

- Special Grenade description

Campaign
In the campaign, the only time smoke grenades are available instead of flash-bang grenades is "All In", which are used for approaching a BMP in order to plant a C4 on it, and "Heat", where they can be used for hiding the player's advance.

Multiplayer
In the Call of Duty 4: Modern Warfare multiplayer, smoke grenades are normally used to hide advancing players. They are commonly used in Domination, or Search and Destroy to hide players who are capturing a flag or defusing a bomb. They can disorient players, so they can be used as a distraction. Smoke produced from the smoke grenade is a fragmentation grenade magnet. Smoke grenades take around three seconds to put up a decent amount of smoke. The smoke lasts around 10 seconds before disappearing.

However, at some angles the player can still be seen in the smoke. To avoid this, it is advised that the player stays in the middle of the smoke or place the smoke between themselves and the enemy.

It must be noted that the Special Grenades x3 perk cannot be used in conjunction with smoke grenades. This was done to prevent smoke grenade spamming.

In multiplayer, smoke grenades can be used as a diversion to lure enemies away. Simply throwing a smoke grenade away from the player into a normally busy area to divert the attention of the enemy (who thinks the player are advancing through or being covered by the smoke), allowing the player to sneak by.

Smoke grenades can be used by snipers who wish to move to a different location on the map. Throw the smoke out and quickly move to the new location.

By using a stun grenade or a flashbang, a player can throw it in a smoke screen to check for enemy players.

Call of Duty 4: Modern Warfare (Nintendo DS)
The smoke grenade on the DS provides more functions than the console versions, as it can provide cover and stun enemies like a Flashbang. Enemies caught in the radius of the smoke will be covering their mouth and nose with one hand and attempting to wave the smoke away with the other hand. If the player is in the radius of the smoke, enemies will not notice the player, if they do, their shots will usually miss the player. This smoke grenade produces very little smoke in some missions (i.e. "Missile Away") but in others it produces a lot of smoke.

Call of Duty: World at War
The smoke grenade in Call of Duty: World at War is basically the same as in Call of Duty 4: Modern Warfare but with minor differences. In single player, it is the Marine default secondary grenade. These can be very helpful on Veteran difficulty if a player is stuck while advancing through a level.

The perk Special Grenades x3 can not be used with Smoke Grenades.

Call of Duty: World at War: Final Fronts
The Smoke Grenade is a default tactical grenade to all the levels in Call of Duty: World at War: Final Fronts. Its appearance is exactly the same as its Call of Duty: World at War counterpart.

Campaign
In Call of Duty: Modern Warfare 2, the smoke grenade appears in "Wolverines!" and in multiple Special Ops missions.

Multiplayer
M8 Smoke Grenades behave much the same as they do in Call of Duty 4. However, with the introduction of the Thermal Scope which can essentially see through smoke, the nature of smoke grenades changes somewhat. As a defensive tool, smoke grenades lose their effectiveness somewhat as more and more opponents complete challenges and acquire and use thermal scopes. Conversely, if the player has a thermal scope equipped, smoke can be used as an offensive tool effectively one-way blinding the enemy. This of course assumes the opponent doesn't have thermal scopes as well. To counter enemy Thermal Scopes consider using Cold-Blooded with smoke grenades, but this can be counteracted with the use of the Heartbeat Sensor which in turn can be counteracted by Ninja. Note in multiplayer this is the only secondary grenade that only can have one carried at a time. Thus when using this, it is advised to also use Scavenger. Also, due to the fact it also affects the player's team, it can be annoying for other team members if used by inexperienced players with no suitable attachments, especially in alleyways and house entrances.

Call of Duty: Modern Warfare 3
The smoke grenade returns in Call of Duty: Modern Warfare 3 and has a similar effect to other games. However, unlike in all other games which feature smoke grenades unlocked from the start, in Call of Duty: Modern Warfare 3 the smoke grenade is not unlocked until level 29. A smoke grenade is automatically obtained with the Juggernaut Pointstreak.

Trivia

 * When the player marks for a Care Package in Call of Duty: Modern Warfare 2 multiplayer, they throw a smoke grenade that emits red smoke, however the grenade uses the white smoke grenade texture, and thus is still, incorrectly, labeled "White Smoke".
 * In Call of Duty: Modern Warfare 2, Ghost uses a red smoke flare in "Loose Ends" as a signal where the helicopter is to shoot at.
 * In Call of Duty: Modern Warfare 2, a cracked window can be used to see through smoke.
 * Call of Duty 2 and Call of Duty: World at War are the only games that use the ANM8 grenade. The other games use the M18. However, like the Mk 2 Grenade in Call of Duty: Modern Warfare 2, if out of smoke grenades the HUD will say the player is out of ANM8 grenades instead.
 * In Call of Duty: Modern Warfare 3, the lower numbering on the smoke grenade spells out "Porter Justice" in leet-speak (POR73R-JU571C3)