Addiction is a human disease.
Why experiment with animals?
Only people normally have sufficient access to drugs.
Strict ethical guidelines to minimize animals' discomfort,
to answer questions.
Craving a substance
in controlled settings.
How strongly does the substance motivate continued use?
Will they undergo a withdrawal syndrome?
The pace of the lever-pressing,
Tremors, loss of appetite, and agitation.
Will they push a lever to obtain more?
Day 7 of the 2014 November PAD Challenge. This is a found poem. The article I used is here.