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Dependency, or addiction, is the most common of long-term heroin effects. Heroin is often considered the most addictive of all legal and illegal substances that are commonly abused for their mind-altering effects.
Effects and dangers of heroin. Heroin is a central nervous system depressant. In the brain, it is converted into morphine, which then binds to the receptors for the opiates that the body produces naturally. These receptors are located in the brain, the spinal cord, and certain internal organs.ffects and dangers of heroin. Heroin is a central nervous system depressant. In the brain, it is converted into morphine, which then binds to the receptors for the opiates that the body produces naturally. These receptors are located in the brain, the spinal cord, and certain internal organs.