This tag should be used for questions in which the impact of a drug (real or fictional) on the thinking and/or behavior of a major character is critical to the plot.

A "drug," for the purposes of this tag, is any substance that substantially alters the mental states of those under its influence.

As drug use is frequently featured in fictional settings, use of this tag should be restricted to those cases in which the drug's effect is a key plot element. If in doubt, please see existing examples of the tags use as a gauge for its applicability.

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