Medical study links steroid abuse to key biological, psychological characteristics

"Pope noted that anabolic steroids do cause actual biological dependence, pointing out that animal studies have shown that hamsters will continue to self-administer testosterone even to the point of death. Human users also exhibit classic criteria for addiction, even though the drugs do not produce a “high” as is the case with opiates, alcohol or other addictive substances, he said."

Of course I would have loved to have a cartoon of a muscular hamster to use at this point.

I'm interested to know exactly how the testosterone killed the poor hamsters. I've never read about testosterone use being the sole cause of death in any humans. I am of course personally strongly against animal testing.