Breath toxic air freely, at a cost.

BLIGHT LUNG

School transmutation; Level cleric 2, druid 2, sorcerer/wizard 2, witch 2

Casting Time 1 standard action

Components V, S, M/DF (a bladder filled with toxic gas)

Range touch

Target living creatures touched

Duration 1 hour/level; see text

Saving Throw Will negates; Spell Resistance yes

The targets are able to breathe toxic gasses freely, rendering the them immune to all inhaled poisons. However, they can no longer breathe uncontaminated air. Divide the duration evenly among all the creatures you touch. This spell has no effect on creatures that can already breathe toxic gasses.