An example of a heroin abuser responding to a placebo would be a(n)__________.

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A "needle freak" refers to an individual who has a psychological dependence on the act of injecting drugs, rather than the drug itself. In this context, a heroin abuser who is a "needle freak" might respond to a placebo if the act of injection is performed, as their addiction is more to the process of injection than to the heroin's pharmacological effects.

An Example of a Heroin Abuser Responding to a Placebo