A new study finds that even moderate alcohol consumption can increase the risk of cancer-related death. KQED's Forum hears from one of the study's authors, who says alcohol is responsible for 20,000 cancer deaths every year. But the study is not without controversy. Some researchers say alcohol may have certain health benefits, and that it's risky to advocate total abstinence. Forum looks at the mechanism by which alcohol may increase cancer death. Should you give up booze altogether?