Slow Suffocation

The target is unable to breathe and is treated as if she is holding her breath (see suffocation).

Strong stimulants, effects that increase the target’s Constitution, or physical trauma (such as taking 10 or more points of damage from a single attack) negate the spell immediately. Creatures that do not need to breathe are immune to this spell. The target is considered to have taken a dose of keif for the purpose of addiction and withdrawal effects.