A customer looks at marijuana for sale at a dispensary in Eugene, Oregon on March 22, 2016. 
Legal marijuana is becoming more and more entrenched in the United States each year, and 2016 looks to be no exception. While possession, sale and consumption of marijuana remains illegal at the federal level, it is permitted for recreational use in four US states: Alaska, Colorado, Oregon and Washington, plus the US capital Washington. / AFP / Andrew Caballero-Reynolds        (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)