I'm not sure you can get a valid control because pain is subjective. The lower pain tolerance in marijuana smokers may be innate, the severity of the MVA injuries may be greater, and/or the smokers like the buzz of the higher levels of opioids.
It may be that long term use lowers pain tolerance, but I'm not sure this study goes any distance toward proving it.
I'm not sure you can get a valid control because pain is subjective. The lower pain tolerance in marijuana smokers may be innate, the severity of the MVA injuries may be greater, and/or the smokers like the buzz of the higher levels of opioids.
It may be that long term use lowers pain tolerance, but I'm not sure this study goes any distance toward proving it.
True that. It's just observational.