Pain patients who used both opioids and cannabis, 92% overwhelmingly prefer the latter

OP is the one who made up this title, picking an eye-catching number and giving everyone the wrong impression. And OP did give the wrong impression since, in addition to picking a flashy number, OP just lied. 92% of the sample preferred pot over NONopiods, not opiods.

The researchers conclude:

Conclusion: Future research should track clinical outcomes where cannabis is offered as a viable substitute for pain treatment and examine the outcomes of using cannabis as a medication assisted treatment for opioid dependence.

So this study is being used to motivate a proper study. It's exploratory research. An indication, even from a strongly biased group, can still motivate research. Imagine they believed that cannabis wasn't helpful over other non-opiods. There would be less motivation for the study then.

Why would they use a biased sampling methodology? Because a random sample is extremely inefficient. The probability of you getting a pain patient who has tried cannabis and other drugs is small. So they took care of one half, people who already use medical marijuana, and looked at the results from the subset that also use other drugs. This is extremely cheap since it was just an email. They explain all their methodology and don't present anything misleading, in my view.

/r/science Thread Parent Link - online.liebertpub.com