Ant Nectar Addiction (Fallout: New Vegas)

 is a form of addiction which can occur in Fallout 3 or Fallout: New Vegas.

Fallout 3
Only Ant Nectar causes this addiction, Fire Ant Nectar is not addictive. Also note that this is the one addiction that cannot be cured by employing My First Laboratory. You must employ a doctor to cure this addiction.

Fallout: New Vegas
There seems to be a bug in New Vegas at the moment which makes the Ant Nectar addiction incurable. Neither doctors nor a Doctor's Bag will make it go away.