PHOTOS: 4/20 celebration on San Francisco's Hippie Hill

Crowds gather at San Francisco's Hippie Hill on Friday, April 20, 2018. (KGO-TV)

SKY7 was above 4/20 celebrations on Hippie Hill in San Francisco on Friday, April 20, 2018. (KGO-TV)

SAN FRANCISCO (KGO) -- Thousands are lighting up on Hippie Hill for San Francisco's 4/20 celebration on Friday, one of the world's largest celebrations of cannabis.

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