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Originally Posted by markksman
I would like to see that study because I don’t believe it.
Some of the recreational states have seen opioid deaths drop significantly.
The study in question is on medical, not recreational, marijuana. There's a review
here from the journal Addiction. Briefly, the evidence that medical marijuana has helped is all from ecological studies, which often have problems with confounding variables. For instance, one thing that apparently no study controls for is the political environment. States without medical marijuana are also more likely to jail opioid users, which previous studies show sharply increases overdose risk after release. There are also studies showing that medical marijuana doesn't by itself reduce opioid usage:
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Epidemiological studies of large samples of chronic pain patients have found that those who use cannabis do not use lower opioid doses than opioid users who do not use cannabis. A recent analysis of two waves of the US National Epidemiologic Survey on Alcohol and Related Conditions found that people who reported cannabis use at baseline were more (not less) likely to have an opioid use disorder 3 years later. This was also true among cannabis users who reported moderate to severe pain and opioid use at baseline.
The recent study is summarized
here. Medical marijuana did appear to cause a reduction in overdose deaths immediately, but the effect seems to have disappeared over time. The study authors speculate that tighter regulation of dispensaries may have caused this, but they don't know. It's possible that recreational marijuana will bring the effect back by making it easier to access, or maybe what's required is a substitute recreational drug, rather than a substitute painkiller, and recreational weed will help via that avenue. For the moment nobody knows.