Heroin is a highly addictive and illegal opioid drug derived from the morphine found in the seedpod of the opium poppy plant. It is typically injected, snorted, or smoked, and its use can lead to severe physical and psychological dependence. In the context of 4.5 Substance Use and Abuse, heroin is an important example of a substance that can be abused and have detrimental effects on an individual's health and well-being.
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