>I predict a wave of anecdotal evidence and broscience along the lines of: - “but it cured my depression”
How's that laughable?
If cannabis can indeed help with depression that might mean more for the quality of life for a person despite "making their brain age faster".
Besides this "faster brain aging" could still be at an insignificant amount.
As in anything, there are tradeoffs.
Besides, as with any study, including the "largest" ones, this should be taken with a grain of salt, until results are solidified and go from mere research to active recommendations and common medical practices.