In recent studies, they've actually been finding that it encourages the growth of new cells. Also it only makes certain people paranoid/ awkward. I get awkward sometimes but I don't freak out and get anxiety. Also I watched a documentary that it is linked to schizophrenia in some cases. If your family has a history of schizophrenia, it can "awaken" it in you. This is also because today marijuana has a MUCH higher THC concentration due to hydroponic growth compared to marijuana 30-40 years ago.