All the locals cope about Nick's narcolepsy medication made me think.
Could he actually start using the medication as replacement after his coke got taken away?
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From what I found it is generally not abused that much, but people with drug history are vulnerable. Using it as a crutch off coke is a possibility.
There doesn't seem many external signs of abuse. But if he starts crushing his pills and snorting them it should manifest some of the same afflictions as snorting coke.
Most information is just about overdosing:
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link to screenshots