DALY CITY — People have been toking up in the Cow Palace parking lot for more than 50 years. This was the first time it was legal. The International Cannabis and Hemp Expo, the first trade show in the United States to allow on-site pot smoking, attracted an estimated 15,000 enthusiasts to Daly City over the weekend. They talked bud, sold products ranging from a $500 water bong to a $19,500 mobile grow house, and discussed how efforts to legalize marijuana would impact their livelihoods. ‘We’re exercising our rights as patients to peacefully gather,’ said Bob Katzman, chief operating officer of the expo, as he stood near the designated puffing area. ‘We’re here to talk about changing some of the existing laws, but we’re not here to break the law.’ Katzman said it took organizers four years to negotiate a permit with a venue that would allow marijuana consumption. It wasn’t possible, he said, until a ‘massive change in the political climate.’ That climate is set to be tested in November, when an initiative that would legalize marijuana is to be decided by California voters. Now, marijuana is available only to those with a medicinal […]