Out on the streets, heroin can have a variety of contaminants. That is, unless you live in one of the few places in the world that allows people recovering from heroin addiction to use medical prescription heroin. Of course, if you are a heroin user, you are unlikely to encounter pure, laboratory-made heroin, made to the strict standards of a legitimate research facility. With prolonged exposure to the air, pure heroin develops this distinctive odor. You would perceive this smell to be the unpleasant smell of vinegar. Yet, if you were to walk through the same lab later, after the heroin container had been left open for a long time, you would smell an acetic odor. So, if you were to walk through a research lab, past a workbench with an open container filled with pure heroin, there would be no smell emanating from the heroin. Like many chemical compounds, pure heroin is odorless.
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