Below is a re post of information provided earlier regarding Washington Initiative 502 (the legalization of recreational marijuana).
Washington voters have passed Initiative 502 and beginning on Thursday December 6, 2012, it is not a violation of Washington state law for adults over 21 years old to possess up to an ounce of marijuana (or 16 ounces of solid marijuana-infused product, like cookies, or 72 ounces of infused liquid, like oil) for personal use. The initiative establishes a one-year period for the State of Washington to develop rules and a licensing system for the production and sale of marijuana. While legal in the State of Washington beginning on December 6, Oregon law has not changed with regards to marijuana possession, distribution or manufacturing.
It's important though to understand that under Oregon law, possession of less than one ounce of marijuana is classified as a violation. It is not a criminal offense and people cannot be arrested or jailed for possession of less than one ounce of marijuana.
Possession of Less than One Ounce of Marijuana has been a low law enforcement priority for 35 years in Portland and this will not change due to the new Washington law.
What is NOT a low law enforcement priority is Driving Under the Influence of Intoxicants (DUII). DUII enforcement remains a high priority for the Portland Police Bureau.
Much like existing fireworks laws, what is legal in Washington is not legal in Oregon, In other words, if it goes high in the air or gets you high, you should probably use it in the Evergreen State.