Prohibitionists continue to shout whatever they can to frighten voters. As more and more U.S. citizens realize that current marijuana laws do more harm than good, the misinformation is going to get stranger and stranger. Just watch. One classic cry is that marijuana might cause cancer. Recent work out of Brown University actually reveals quite the opposite. Researchers gathered hundreds of people from Massachusetts who had head or neck cancers and compared them to similar people from the same neighborhoods…