Prolonged stress caused due to excessive mental, emotional and
physical exhaustion leads to vapeurs (vapors) condition. Usually, you
feel inundated and unable to meet your increasing demands physically
and psychologically. Exhaustion often leaves you uninterested or
annoyed to perform any work that requires enthusiasm, constant effort
and responsibility. It brings down your energy level and reduces your
efficiency quotient. You may start feeling helpless, dispirited,
skeptical, and indignant .
http://vapeurs.blogs4us.com/2010/12/08/measures-to-prevent-vapeurs-and-solution-to-combat-vapeurs/