Answer the following question given this paragraph: 

Psychoactive drugs affect the brain and influence how a person feels, thinks, or acts. They include medicines and other legal drugs as well as illegal drugs. They may stimulate or depress the central nervous system. Abuse of such drugs may lead to drug addiction, overdose, and death.


Q: What substances affect the brain and influence how a person feels, thinks, or acts?


A:
psychoactive drugs or drugs