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Thousands of people lit up joints, bongs, pipes and marijuana cigarettes at exactly 4:20 pm during the Colorado 420 Rally at Civic Center Park in Denver on April 20, 2014. Thousands of people lit up and smoked marijuana to celebrate the now legal use of marijuana in the state of Colorado. (Photo By Helen H. Richardson/ The Denver Post) ( cd21420RALLY_HHR_6371 )

People in the audience scream and cheer for rap singer B.o.B.as he performs for thousands during the Colorado 420 Rally at Civic Center Park in Denver on April 20, 2014. Thousands of people lit up marijuana pipes, cigarettes, joints, and bongs at exactly 4:20 pm to celebrate the now legal use of marijuana in the state of Colorado. (Photo By Helen H. Richardson/ The Denver Post) ( cd21420RALLY_HHR_6688 )

A crowd gathers for the smoke out at the 420 celebration at the Denver 420 Rally in Civic Center Park April 20, 2014 Denver, CO (Photo By Joe Amon/The Denver Post) ( CD420RALLYPHOTOS )

A young girl with flowers on her head and the 420 symbol on her cheek enjoyed the rap music of B.o.B. who performed at the Colorado 420 Rally at Civic Center Park in Denver on April 20, 2014. Thousands of people lit up marijuana pipes, cigarettes, joints, and bongs at exactly 4:20 pm to celebrate the now legal use of marijuana in the state of Colorado. (Photo By Helen H. Richardson/ The Denver Post) ( cd21420RALLY_HHR_6714 )

22 year old Don Blosser of Denver smokes a joint as he hula hoops after the smoke out at the 420 celebration at the Denver 420 Rally in Civic Center Park April 20, 2014 Denver, CO (Photo By Joe Amon/The Denver Post) ( CD420RALLYPHOTOS )

Marijuana smoke fills the air at 4:20 pm during the 420 celebration at the Denver 420 Rally in Civic Center Park April 20, 2014 Denver, CO (Photo By Joe Amon/The Denver Post) ( CD420RALLYPHOTOS )

People smoke pot as the clock strikes 4:20 during the 420 Rally at Civic Center Park in Denverlorado on April 20, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )

Attendees listen to the music as they wait for 4:20 during the 420 Rally at Civic Center Park in Denverlorado on April 20, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )

"Huggalo" of Colorado Springs makes his way around the booths at the 420 celebration at the Denver 420 Rally in Civic Center Park April 20, 2014 Denver, CO (Photo By Joe Amon/The Denver Post) ( CD420RALLYPHOTOS )

People smoke pot as the clock strikes 4:20 during the 420 Rally at Civic Center Park in Denverlorado on April 20, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )

Rap singer B.o.B. takes pictures with a cell phone as he performed for thousands during the Colorado 420 Rally at Civic Center Park in Denver on April 20, 2014. Thousands of people lit up marijuana pipes, cigarettes, joints, and bongs at exactly 4:20 pm to celebrate the now legal use of marijuana in the state of Colorado. (Photo By Helen H. Richardson/ The Denver Post) ( cd21420RALLY_HHR_6531 )

People smoke pot as the clock strikes 4:20 during the 420 Rally at Civic Center Park in Denverlorado on April 20, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )

Zach Rose, 24, of Colorado Springs, dances to the music during the 420 Rally at Civic Center Park in Denverlorado on April 20, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )

Officers with the Denver Police Department keep an eye on people as they leave the 420 Rally at Civic Center Park in Denverlorado on April 20, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )

Adam Rosen, 29, of Denver, hits his pipe at the 420 celebration at the Denver 420 Rally in Civic Center Park April 20, 2014 Denver, CO (Photo By Joe Amon/The Denver Post) ( CD420RALLYPHOTOS )

A woman rolls a joint while wearing marijuana plant inspired socks and leggings while attending the Colorado 420 Rally at Civic Center Park in Denver on April 20, 2014. Thousands of people lit up marijuana pipes, cigarettes, joints, and bongs at exactly 4:20 pm to celebrate the now legal use of marijuana in the state of Colorado. (Photo By Helen H. Richardson/ The Denver Post) ( cd21420RALLY_HHR_7392 )

Don Blosser, 22, of Denver (center of the photo) continues to celebrate after the smoke out at the 420 celebration at the Denver 420 Rally in Civic Center Park April 20, 2014 Denver, CO (Photo By Joe Amon/The Denver Post) ( CD420RALLYPHOTOS )

Billy Hart of Denver dancing during the 420 celebration at the Denver 420 Rally in Civic Center Park April 20, 2014 Denver, CO (Photo By Joe Amon/The Denver Post) ( CD420RALLYPHOTOS )

Thousands of people lit up joints, bongs, pipes and marijuana cigarettes at exactly 4:20 pm during the Colorado 420 Rally at Civic Center Park in Denver on April 20, 2014. Thousands of people lit up and smoked marijuana to celebrate the now legal use of marijuana in the state of Colorado. (Photo By Helen H. Richardson/ The Denver Post) ( cd21420RALLY_HHR_7850 )

Linda West with her Chihuahua, Charlie, came from Houston Texas to celebrate 420 at the Denver 420 Rally in Civic Center Park April 20, 2014 Denver, CO (Photo By Joe Amon/The Denver Post) ( CD420RALLYPHOTOS )

The rap singer B.o.B. brought women up on the stage to "Twerk" for the audience during his show at the Colorado 420 Rally in Civic Center Park in Denver on April 20, 2014. Thousands of people lit up marijuana pipes, cigarettes, joints, and bongs at exactly 4:20 pm to celebrate the now legal use of marijuana in the state of Colorado. (Photo By Helen H. Richardson/ The Denver Post) ( cd21420RALLY_HHR_7930 )

People in the audience cheer for rap singer B.o.B.as he performs for thousands during the Colorado 420 Rally at Civic Center Park in Denver on April 20, 2014. Thousands of people lit up marijuana pipes, cigarettes, joints, and bongs at exactly 4:20 pm to celebrate the now legal use of marijuana in the state of Colorado. (Photo By Helen H. Richardson/ The Denver Post) ( cd21420RALLY_HHR_6427 )

A wayward gentlemen is helped by security away from the 420 celebration at the Denver 420 Rally in Civic Center Park April 20, 2014 Denver, CO (Photo By Joe Amon/The Denver Post) ( CD420RALLYPHOTOS )

420 celebration at the Denver 420 Rally in Civic Center Park April 20, 2014 Denver, CO (Photo By Joe Amon/The Denver Post) ( CD420RALLYPHOTOS )

People smoke pot as the clock strikes 4:20 during the 420 Rally at Civic Center Park in Denverlorado on April 20, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )

Hundreds of people lit up joints, bongs, pipes and marijuana cigarettes at exactly 4:20 pm during the Colorado 420 Rally at Civic Center Park in Denver on April 20, 2014. Thousands of people lit up and smoked marijuana to celebrate the now legal use of marijuana in the state of Colorado. (Photo By Helen H. Richardson/ The Denver Post) ( cd21420RALLY_HHR_7506 )

Hundreds of people lit up joints, bongs, pipes and marijuana cigarettes at exactly 4:20 pm during the Colorado 420 Rally at Civic Center Park in Denver on April 20, 2014. Thousands of people lit up and smoked marijuana to celebrate the now legal use of marijuana in the state of Colorado. (Photo By Helen H. Richardson/ The Denver Post) ( cd21420RALLY_HHR_7623 )

A cross blunt during the 420 Rally at Civic Center Park in Denverlorado on April 20, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )

Thousands of people lit up joints, bongs, pipes and marijuana cigarettes at exactly 4:20 pm during the Colorado 420 Rally at Civic Center Park in Denver on April 20, 2014. Thousands of people lit up and smoked marijuana to celebrate the now legal use of marijuana in the state of Colorado. (Photo By Helen H. Richardson/ The Denver Post) ( cd21420RALLY_HHR_7656 )

People in the audience cheer for rap singer B.o.B.as he performs for thousands during the Colorado 420 Rally at Civic Center Park in Denver on April 20, 2014. Thousands of people lit up marijuana pipes, cigarettes, joints, and bongs at exactly 4:20 pm to celebrate the now legal use of marijuana in the state of Colorado. (Photo By Helen H. Richardson/ The Denver Post) ( cd21420RALLY_HHR_6589 )

Chanti Sisson 28 of Aurora is painted by Ryan Winckler 30 of Denver as LaTosha Taylor 30 of Denver looks on during the 420 celebration at the Denver 420 Rally in Civic Center Park April 20, 2014 Denver, CO (Photo By Joe Amon/The Denver Post) ( CD420RALLYPHOTOS )

A man smokes a blunt as the clock strikes 4:20 during the 420 Rally at Civic Center Park in Denverlorado on April 20, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )

Anthony Parker from New York, front, is smoking marijuana during the first day of the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

Sarah Rader of Colorado Springs is hula hooping during the first day of the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

J.D. from South Dakota is smoking marijuana during the first day of the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

People celebrate the first day of the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

Robin Goldfarb from Flagstone, TX is smoking marijuana during the first day of the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

Kyle Capron from Flagstone, TX is smoking marijuana during the first day of the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

Margaret Henry of Denver, right, smokes marijuana with her boyfriend Wililam Lagrand during the first day of the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

Tamara Starpayseno of Denver is celebrating with the dance during the first day of the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

Anthony Parker from New York, left, is smoking marijuana during the first day of the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

Daniela Ralph from Ohio is celebrating during the first day of the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

Timothy Ralph from Ohio puts a sticker on his hat during the first day of the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

A security tower is installed for the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

Artist Robin Muruno, top right, celebrates finishing his splay painting work with Chenoa Klakowicz, left, during the first day of the 420 Rally weekend in Civic Center Park, Denver, Colorado, April 19, 2014. (Photo by Hyoung Chang/The Denver Post) ( CD420RALLYPHOTOS(1) )

JR Turner, 19, of Denver, sports a superman cape and marijuana leaf necklace as he chats with friends while Wyclef Jean plays during the 420 Rally at Civic Center Park in Denver, Colorado on April 19, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )

"Chaz" shows off his marijuana themed hat during the 420 Rally at Civic Center Park in Denver, Colorado on April 19, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )

A glittery pot leaf adorns the cheek of an attendee during the 420 Rally at Civic Center Park in Denver, Colorado on April 19, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )

A woman takes a cigarette break in front of a mural during the 420 Rally at Civic Center Park in Denver, Colorado on April 19, 2014. (Photo by Seth McConnell/The Denver Post) ( 420 Rally )