Other research showed that if you adjust for those that are smoking also the risk from marijuana disappears. I'd say this was bad research.
So fucking what? The uses for stroke rehabilitation would likely be short-term. But our stupid federal legislators will glom onto anything negative about marijuana and not even approve research proving the positives. With this mindset aspirin, alcohol and warfarin would have never been approved. I would suggest moving to one of the legal states or countries.
But don't listen to me, I have absolutely no medical training, you don't need medical training to read and understand research or its' good points on your own.