The immediate human cost of the US opioid epidemic can be measured in the deaths from so-called overdose. In 2016, deaths from prescription opioids and their street cousins, opiates -- heroin, fentanyl -- (59,000), exceeded deaths from gun violence (including suicide by gunshot) (31,000) and car accidents (34,000).
Deaths from opioids is a measure of extent of usage because "overdose" is a misnomer. Opioids all act to suppress respiration in the brain's medullary centre, which controls breathing. It's closer to understanding to say that the action of opioids is that the brain "forgets" to signal the body's breathing. The higher the number of users, the greater the number of deaths.
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In addition to the hazard of death or of infection -- hepatitis C, HIV, or other infection -- users face the criminal justice system. While addiction is not a crime but an illness according to the 1962 US Supreme Court decision (Robinson v California), it is generally treated by local authorities as a crime. Or addicts face jail for crimes (mostly theft) they commit to support their habit.
Enter the substance abuse treatment industry and return of Big Pharma. There are many good drug rehabilitation centres in the US, and their work must be acknowledged as difficult and often frustrating as patients leave and relapse. In this maelstrom, opportunistic profiteers have emerged, as the New York Times recently described the situation in Del Ray Beach, Florida, where some operators, paid by government insurance, simply churn the addicts through, knowing the drug pushers are waiting outside.