In behaviourist terms, when is a drug considered a negative reinforcer?

Question

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A negative reinforcer is something that removes an aversive stimulus, increasing the likelihood of the behavior that led to its removal. In the context of drug use, a negative reinforcer would be a drug that stops a person from feeling bad, such as relieving anxiety or depression. A drug can also be a positive reinforcer if it makes a person feel good or experience pleasure. A high risk of physiological dependency would not be the determining factor in whether a drug is a negative reinforcer or not. A drug causing withdrawal symptoms when use is stopped would be considered a punishing consequence, not a negative reinforcer.

In Behaviourist Terms, When Is a Drug Considered a Negative