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EQUIP a gas emitter. FIRE to throw the emitter that perpetually remains throughout the round. ALT FIRE to lob. RE-USE the ability to create a toxic gas cloud at the cost of fuel. This ability can be RE-USED more than once.
— In-game description

Poison Cloud is a basic ability for Viper.


Poison Cloud is a Vision Blocker ability that Viper must equip before casting. Upon casting she throws an emitter forward that sticks as soon as it comes into contact with a horizontal surface. Viper can use Primary and Alt Fire to control the length of the throw; Primary Fire throws the emitter at long range while Alt Fire throws it at short range. During the buy phase the emitter can be picked up to regain the charge, but once the round has started it cannot be recalled.

While deployed, Viper can activate the ability to cause the emitter to create a smoke that rapidly expands from the emitter's location. Vision within the smoke is obscured. While active, the smoke consumes Fuel. If Viper runs out of fuel, or upon reactivation, the smoke will expire, rapidly shrinking. Viper can then reactivate to reform the smoke once more as long as she has replenished enough fuel to spend. There are short cooldowns between uses whenever Viper turns the smoke on or off.

Enemy agents who come into contact with the smoke are affected by Toxin.


Viper has a Resource Bar of 100 Fuel. Activating Poison Cloud requires Viper to consume Fuel at a rate of 1 every 0.12 seconds (8.33/sec). However, if Viper also has Toxic Screen activated, the combined use will consume Fuel at a rate of 1 every 0.08 seconds (12.5/sec). If her fuel levels run out, Poison Cloud automatically deactivates and Viper must wait for her fuel levels to replenish, which will happen at a rate of 1 every 0.3 seconds (3.33/sec). Viper must have a minimum of 30 Fuel to activate Poison Cloud.


If an enemy agent comes into contact with Poison Cloud, their health will decay. They will instantly decay 30 HP upon contact, then continue to decay for 1 HP every 0.1 seconds (10 HP/sec). If no longer in contact, the debuff will remain for 1.5 seconds before their health begins to climb back up at a rate of 1 HP every 0.04 seconds (25 HP/sec), up to a maximum of how much HP they would have if they had not been affected, taking any damage and healing taken while they were decayed into account.


See above for Fuel and Toxin stats that are relevant to this ability.

Stat Value Confirmed
CustomReload Equip time 0.8 seconds Check MarkGame files
CustomReload Unequip time 0.7 seconds Check MarkGame files
Tailwind Pickup distance 4 meters Check Markv2.06
Windup Windup time Total 1.75 seconds
0.75-second windup (fuel consumed after this point)
1 second for smoke to fully form
Orbital Strike Radius 4.5 meters Check Mark[a]
Windup Deactivation time 0.8 seconds Check Markv4.04
Cooldown Activation cooldowns 2 seconds (Deactivation) Check MarkGame files
5 seconds (Activation) Check Markv8.08

* Values that are not marked as confirmed (i.e. values not provided explicitly in game or from patch notes) are only estimates. Whilst they may not be the true value, they have been tested so that they should be very accurate.
a Same size as Snake Bite

Update History[]

Note: Updates to Fuel and Toxin may be relevant to this ability.

  • Buff Cooldown on re-activating smokes after putting them down reduced 5.5 >>> 5s
  • Nerf Can now only be picked up during the Buy Phase


  • Adjustment Art update for grenade


  • Buff Cooldown on re-activating smokes after putting them down reduced 8 >>> 5.5s


  • Bugfix Fixed a bug where Poison Cloud would sometimes disappear from the minimap


  • Nerf Removed delay on Poison Cloud disabling when Viper is suppressed
  • Added Added a unique VO line that plays when Poison Cloud is disabled by suppress
  • Adjustment Poison Cloud emitter now has a yellow light to indicate when the ability is on cooldown
  • Nerf Cooldown after deactivating increased 6 >>> 8
  • Nerf Cooldown timer now starts when her smoke starts dissipating instead of when the deactivation telegraph plays
    • Cooldown displayed on HUD actually starts on deactivation telegraph but combines both the deactivation and cooldown durations
  • Buff Deactivation delay decreased 1 >>> .8


  • Nerf Updated the visuals for the dissolving effect seen within the smoke to better match the visuals seen from the outside, in an attempt to remove any type of peeker’s advantage when playing from within the smoke


  • Bugfix Fixed a bug where concurrent, overlapping ally and enemy Poison Clouds could cause the nearsight and decay to never remove


  • Bugfix Buff Fixed Poison Cloud pickup distance being 200 instead of the intended 400


  • Nerf Held charge is now temporary if gained from picking up a placed emitter and will not carry over to the next round
  • Buff Can now immediately be redeployed when picked up
  • Buff Pickup distance increased 200 >>> 400
  • Buff If active when Viper dies, Poison Cloud now remains up for an additional 2 seconds, or until Viper runs out of fuel
  • Bugfix Buff Fixed unintentional delay when deactivating Poison Cloud


  • Nerf Activation cooldown increased .5s >>> 6s


  • Bugfix Nerf Fixed the ability to activate Poison Cloud mid air if it has been picked up


  • Buff No longer enters cooldown when picked up during the buy phase