Animal Study Links Missing Brain Enzyme With Addiction to Painkillers

The nature-nurture debate is alive and well in the world of drug addiction research. Scientists and addiction experts have long-speculated whether the biological factors—genetic variations and the resulting susceptibility—or the psycho-social factors—like depression, parental substance abuse, or socioeconomic disadvantage—are responsible for addiction. It’s generally agreed that both factors contribute to addiction, with at least 50…