By Nick Allen, Los Angeles
6:44PM GMT 06 Dec 2012
In the city of Seattle pro-cannabis campaigners celebrated in a haze at the foot of the Space Needle tower at one minute past midnight, the moment the state's new law came into effect.
Vivian McPeak, director of Seattle's annual Hempfest, said: "This is a big day because all our lives we've been living under the iron curtain of prohibition. The whole world sees that prohibition just took a body blow."
The new law only allows cannabis to be smoked inside, and doing so in public is still subject to a $100 fine.
However, the Seattle Police Department told its 1,300 officers that until further notice they shall not issue tickets, and no officers were present at the Space Needle event.
On the city's police website, spokesman Jonah Spangenthal-Lee said: "The department's going to give you a generous grace period to help you adjust to this brave, new, and maybe kinda stoned world we live in."