Beer, pretzel, bratwurst… and a joint? Smoking weed in public is now legal in Germany as of the start of April. Does that mean a purple haze is about to descend on the world’s largest beer festival? Oktoberfest organizers in the southern state of Bavaria have been tight-lipped about what Germany’s budding cannabis culture means for this annual booze-up. “The effects of the law on events will only become clear in a few weeks or months,” a spokesman for the Department of Economic Affairs of the City of Munich said. If new cannabis-related rules for the Volksfest become necessary, these will be…