RT Journal
A1 Knight JR
T1 A 35-year-old physician with opioid dependence
JF JAMA
JO JAMA
YR 2004
FD September 15
VO 292
IS 11
SP 1351
OP 1357
DO 10.1001/jama.292.11.1351
UL http://dx.doi.org/10.1001/jama.292.11.1351
AB 
Some time later, Dr L became ill with an upper respiratory tract infection.
Again, he self-treated his symptoms, this time with a cough syrup containing
hydrocodone that he obtained from his office sample closet. The hydrocodone
improved not only his cough but also his mood, and he began to take it regularly
to get through the day, even after his cough resolved. It allowed him to function
at a level he perceived as higher than his normal baseline: he was productive,
attentive, happy, and energized. He began requiring more and more of the hydrocodone
to achieve these effects.