Nonaddict

But methadone is a dangerous drug. If taken orally by a nonaddict, it can cause euphoria or even death.

Source: wiktionary

What the science shows, he says, is that the brain of an addict is fundamentally different from that of a nonaddict.

Source: wiktionary

Those nonaddicts who picked a winning card had increased blood flow to the striatum, but the gambling addicts who picked the right card had much less of it (their reward system was less active).

Source: wiktionary

Dr. Nora Volkow, director of the National Institute on Drug Abuse, has shown in several brain-imaging studies that people addicted to such drugs as cocaine, heroin and alcohol have fewer dopamine receptors in the brain’s reward pathways than nonaddicts.

Source: wiktionary