A new study reveals that nearly 1 in 10 adults prescribed ADHD drugs are addicted—many without ever “misusing” them—in an epidemic the psychiatric industry fuels for profit.

Opioid medications, including oxycodone, hydrocodone, morphine, and fentanyl, are often prescribed to treat severe pain, while methadone is primarily used in addiction treatment centers.

An estimated one in 100 Scots are addicted to opioids, according to Scotland’s public health watchdog. The number of people ...