Story title: Monkey Addicts Story
A scientist conducted an experiment in which he made cocaine available to some monkeys. These monkeys could pull a lever in their cages to release a little cocaine into their feeding tray. Not surprisingly, the monkeys became addicted to the drug. As the experiment continued, the scientist found that if the addicted monkeys could get additional cocaine hits any time they wanted by just pulling the lever, all of them would overdose. They all ended up killing themselves.