Poison:
Remember that poison is almost always lethal for humans, there are the rules for exalted:
they need to roll Stamina + Resistance with a difficulty equal to the difficulty of the poison.
If they succeed they take a number of health level equal to the success characteristic of the poison (no roll, the damage is automatic). If they fail they lose a number of health level equal to the failure characteristic of the poison.
A penalty is applied to all rolls, reflecting the hallucinogenic and convulsive effects of the poison, this penalty is added for a number equal to the duration of the poison.