Adrug that is created by slightly modifying the molecular structure of another substance is a(n) drug.

Synthetic

Explanation:

Synthetic drugs are drugs that are man-made and chemically-created in a lab by modifying the molecular or chemical structure of another substance. The synthetic drug now has properties and effects that are similar to that of the substance that is being mimicked.

Various illicit drugs such as marijuana and cocaine are being synthesized to create synthetic drugs to mimic them. An example of a synthetic drug is synthetic marijuana also called Spice or K2.

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