Gamespot leaked the patch notes in advance (Buffs/Nerfs/Seer/Weapon changes)

Caustic (Buff)

• Instead of five ticks of damage per second, Caustic's gas will now increase in damage every other second (so 5, 5, 6, 6, 7, 7, etc.) with no limit on how much it can increase.
• The gas cloud created from Caustic's Nox Gas Grenade dissipates five seconds sooner.

I thought they buff Caustic with unlimited damage, then decrease grenade 5 seconds sooner ???

That OLD man only last 1-2 seconds then, Just plug it in, and DONE already ??  LMAO