10 things to know about nation’s first recreational marijuana shops in Colorado

Updated 7:40 PM EST, Wed January 1, 2014

Story highlights

Marijuana is sold like alcohol in Colorado, to those age 21 and older

Residents can buy up to an ounce, and out-of-staters can buy a quarter ounce

Colorado becomes the first state in the nation to open recreational pot stores

It's also the first in the world where pot will be regulated from seed to sale

(CNN) —  

Colorado began allowing the sale of recreational marijuana on January 1 to anyone age 21 or older.

Residents can now buy marijuana like alcohol – except the cannabis purchase is limited to an ounce, which is substantial enough to cost about $200 or more.

It’s a big moment: Colorado became the first state in the nation to open recreational pot stores and became the first place in the world where marijuana will be regulated from seed to sale. Pot, by the way, is the third most popular recreational drug in America, after alcohol and tobacco, according to the marijuana reform group NORML.

Retail pot: Would you buy?

Here are 10 things to know about what will be a closely watched landmark law.

How can this be?

Voters wanted this. And the law is now in the Colorado constitution after 55% of voters said yes to legalizing recreational marijuana.

Colorado wasn’t the only state to OK this in November 2012. Voters in Washington also said yes, but that state won’t open marijuana retail outlets until later in 2014.