If you take too much acid you might suffer from LSD-psychosis in which you will be basically like a schizophrencic person for the rest of your life. You might be able to regain some sanity from anti-psychotic medications but you will never be "right" ever again....with all drugs there are risks and you have to weigh the risks vs the benefits of the substance. In my opinion LSD is the best drug on earth and is well worth the risk. On a little side note you would need to take a LARGE amount of LSD in order to suffer LSD-psychosis. Im not talking 2 or 3 hits, more like 15 or 20 at one time and you might be in trouble.