Hexane is a solvent.  It causes central nervous system damage with prolonged
exposure.  It's probably the most common organic solvent, and some sources
include paint thinner, spray adhesives, spray fixatives, rubber cement and
rubber cement thinners, contact adhesives, cleaning and sanitizing agents,
and naphthas.  Also watch for art supplies, especially oil paints (hexane is
frequently used as an oil solvent), photgraphy materials, anything used to
dissolve grease or oil, or adhesives.  It could also hang around in pockets
long after use in a place with little or no ventilation, such as a basement.
 
It probably wouldn't be in candles (was asked about this) because it is
highly inflammable and you'd have a fun little fire on your hands if it
was in the candle.
 
Another fun way hexane can kill is forming a stable ring structure that is
flat and can slip between base pairs in dna and cause cancer.  Lovely
material.
 
Some info about hexane is at:
http://www.emeraldcoast.com/government/emergency/chemical.htm
 
Good luck.
[Posted in FML issue 2323]