Overall, while less dangerous than opioids by far, and possibly helpful for some conditions, including pain, no findings, to my knowledge, clearly demonstrate that marijuana use positively impacts people with opioid use disorder. Moreover, marijuana use carries risks, including cannabis use disorder, psychosis and cognitive impairment, as well as additive effects when used with other substances, including opioids.
Links
[1] http://thehill.com/opinion/healthcare/377633-we-cant-claim-that-marijuana-is-a-treatment-for-opioid-addiction-without