The evidence isn't conclusive, but it seems to be leaning towards no? There appear to be links between weed usage and schizophrenia, for one thing. Why is the left and the media continually pushing to legalize weed in more and more states?
https://www.newyorker.com/magazine/2019/01/14/is-marijuana-as-safe-as-we-think
https://www.newyorker.com/magazine/2019/01/14/is-marijuana-as-safe-as-we-think