Cannabis use appears to increase rather than decrease the risk of developing nonmedical prescription opioid use and opioid use disorder.
Links
[1] https://ajp.psychiatryonline.org/doi/abs/10.1176/appi.ajp.2017.17040413
[2] http://www.rethinkpot.org/tags/psychiatryonline
[3] http://www.rethinkpot.org/tags/opioid