Although there are those who are helped by using, there are far too many who experience side effects like psychosis. Ask emergency doctors, police and EMTs and they will tell you about the enormous increase in numbers of psychosis cases since pot became legal here in California. Dr. Daniel Amen’s brain scan research also show brain abnormalities in those who use pot — especially among those who begin using while teenagers. After looking at thousands and thousands of brain scans his finds show the brain damage among this population of heavy users to be worse than that of alcoholics. So just like any other medication or substance, there are side effects. Can the drug be helpful? Yes. Is it harmless? No, far from it.