Patients who inhale poisons to get high are often referred to as _____________?

Huffing usually occurs by placing  a small amount of chemical, glue, paint or cleaner in a paper bag and then the huffer places the bag over their mouths and/or noses and inhales deeply.  This causes an anoxic response in the brain which causes all of the blood vessels to dilate.  This gives the huffer a period of euphoria and then a pounding head ache.