Susceptible to Poison:

Susceptible to Poison is of the negative traits.
It has a value of -3

The description is as follows:

Susceptible to Poison:
Your body is especially susceptible to poisoning, compared to your fellow humans (or similar creatures).
Effectively this means, that the amount of hit points lost to poison is doubled. You metabolize poison as fast as others however and in any other respect, the poison rules stay the same.