RELATED: Thousands gather for 4/20 at San Francisco's Golden Gate Park
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The pot smoke of 15,000 joints and pipes almost created its own hazy fog bank on Hippie Hill.
"I like a good positive vibe, lovely ladies," said marijuana fan Olu Afolabi. "I came for a good time mostly."
Dozens of city park and rec workers began the massive garbage pickup in Golden Gate Park following the popular 4/20 celebration.
"You're supposed to take one piece of trash with you," said visitor Victor castro.
There were new rules at the celebration this year. The city issued a permit so you had to be 21 to get in. And there was no selling marijuana inside.
Local merchants paid for fencing, porta potties, and security.
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When asked if she wanted to see more rules, attendee Jessica Daniels said, "It is what it is. People still came out and had a good time."
Last year, city workers collected a whopping 11 tons of trash left behind. This year, they picked up all day long. Most of the garbage will be recycled or composted.
PHOTOS: 15,000 people gather for Golden Gate Park 4/20 celebration
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