From reading the abstract.

> Compared to non-users, non-medical cannabis use was significantly associated with 96% decreased odds of SCD (aOR=0.04, 95% CI=0.01-0.44, p<.01). Medical (aOR=0.46, 95% CI=0.06-3.61, p=.46) and dual medical and non-medical use (aOR=0.30, 95% CI=0.03-2.92, p=.30) were also associated with decreased odds of SCD, although not significant.

I'm not a native speaker but if non-medical use of cannabis has a different outcome than medical and mixed use than it seems plausible that there are other - more important - factors at play or do I misunderstand the paragraph?