Substances refer to drugs or other addictive substances that can alter a person's mental state and behavior. They include alcohol, nicotine, prescription medications, and illegal drugs.
Related terms
Withdrawal symptoms: The physical and psychological effects that occur when someone stops using a substance abruptly.
Tolerance: The body's reduced response to a drug over time, leading to the need for higher doses to achieve the same effect.
Relapse: Returning to substance use after an attempt at quitting or reducing consumption.