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Psychoactive drugs are substances that affect the brain. They cause changes in awareness, thoughts, mood, and behavior. Depending on the substance, psychoactive drugs can cause euphoria, increased energy, sleepiness, hallucinations, and more.

Depending on the situation, the effects of psychoactive drugs may be beneficial or harmful. The phrase “psychoactive drug” often refers to illegal substances, such as lysergic acid diethylamide (LSD), heroin, and cocaine. [...]

Nicotine, alcohol, and caffeine are all types of psychoactive substances that people frequently consume. In fact, roughly 80%Trusted Source of adult Americans consume caffeine daily.