Instant Poison

Instant Poison is the first damaging poison that can can purchased and applied to a rogue's weapon. Once applied, each successful weapon hit has a chance (modified by the speed of the weapon) to instantly inflict nature damage. It is sold by Poison Supplies vendors for.

Proc chances under the PPM model
As of patch 3.1., the proc chance of Instant Poison (along with Wound Poison was changed to a PPM model, normalized for 1.4 speed weapons. This results in the following proc chances per weapon speed per attack:

The chance of applying a PPM poison is normalized to a 1.4 weapon speed: After normalization, slow weapons will have a higher PPH rate than fast ones. Working backwards:
 * PPM = Base Proc Rate * 60 / Weapon Speed = 0.20p/hit * 60s/min / 1.4s/hit = 8.57 p/min
 * PPH (for a 2.8 weapon) = Normalized Proc Rate * Weapon Speed / 60 = 8.57p/min * 2.8s/hit / 60s/min = 40% proc/hit