Opioid addiction treatment is scarce in states with Medicaid work requirements and those states have more opioid overdose deaths, researchers find.

Tolerance for risk may indicate a higher chance for relapse among people getting treatment for opioid addiction, research finds.

Researchers thought drinking might result in reduced brain size, but new research turns that idea on its head.

How much do the behaviors of obesity and addiction overlap? A look at personality research finds some connection, but it's complicated.

Analyzing wastewater from around the world gives a clearer picture of illegal drug use trends in different cities.

Prescription rates in England for benzodiazepines and other similar drugs are highest in deprived areas, research finds. But why?

The percentage of young adults with a substance use disorder who were able to stop using substances was extremely low, the study finds.

Mindfulness shows promise as a supplement to methadone therapy for opioid addiction and chronic pain.

A new test can find opioids in a person's breath, which could catch illegal use and make sure patients are taking their medication correctly.

Smoking abstinence doesn't have that much effect on our desire to eat, a new study shows.