You’re implying a reversal of the Norse of events. He was a daily meth user before he was in harm
Reduction.
These stories usually feature someone who went clean. That it's someone who still using and contributing to society makes it unexpected. (I hadn’t considered the possibility of a functional meth addict.)
And although more rare, functional desoxyn users too, which is a methamphetamine pill typically used for narcolepsy and severe obesity.