What can result from the abuse of psychoactive drugs?

• A. It has no long-term effects
• B. It leads to addiction, which changes the brain's structure and chemistry
• C. It only affects mood temporarily
• D. It improves brain function over time

Answer: (B)

Abusing psychoactive drugs repeatedly reshapes the brain’s reward and stress systems. Repeated drug use drives large dopamine surges in the reward pathway, and the brain adapts by changing receptor density and neurotransmitter balance. These neuroadaptations create tolerance, withdrawal, and compulsive drug-seeking, which are lasting changes in how the brain works. That’s why addiction is described as a brain disease with structural and chemical changes that persist beyond initial use. The other statements ignore or misstate these lasting neurobiological effects, suggesting no long-term impact, only temporary mood changes, or even improvement, which don’t align with how chronic drug abuse actually alters the brain.