Celebrating 420

Partygoers listen to live music and smoke pot on day two of the annual 420 Rally in Denver on Sunday, April 20, 2014. <a href='http://www.cnn.com/2013/04/20/opinion/reiman-marijuana-day/' target='_blank'>420 is a once clandestine term used in pot culture to refer to marijuana. </a>

Partygoers listen to live music and smoke pot on day two of the annual 420 Rally in Denver on Sunday, April 20, 2014. 420 is a once clandestine term used in pot culture to refer to marijuana.