https://aeon.co/ideas/solving-the-heroin...s-can-kill
EXCERPT: Heroin, like other opiates, depresses activity in the brain centre that controls breathing. Sometimes, this effect is so profound that the drug user dies, and becomes yet another overdose casualty. Some of these victims die because they took too much of the drug. Others die following self-administration of a dose that appears much too small to be lethal, but why? This is the heroin overdose mystery, and it has been known for more than half a century...
EXCERPT: Heroin, like other opiates, depresses activity in the brain centre that controls breathing. Sometimes, this effect is so profound that the drug user dies, and becomes yet another overdose casualty. Some of these victims die because they took too much of the drug. Others die following self-administration of a dose that appears much too small to be lethal, but why? This is the heroin overdose mystery, and it has been known for more than half a century...