As CNN puts it, "they are partying in Portland." That's because recreational pot became legal today in Oregon, the fourth state behind Colorado, Washington state, and Alaska, as well as the District of Columbia, to take this step, the AP reports. Medical marijuana is already legal in 23 states plus DC, per the National Conference of State Legislatures. What this means broadly: If you're 21 and older in Oregon, you can possess and use marijuana in the privacy of your own home or on other private property, keep up to 8 ounces at your home (and carry 1 ounce outside the home), and grow up to four pot plants per residence, as long as they're kept out of public view. Other things to know, per CNN, the AP, and the Oregonian: