The booming industry was expected to post nearly $10 billion in sales in 2017.
Here's a summary of where Americans can legally light up in 2018.
It was the first state to legalize medical marijuana back in 1996. California became even more pot-friendly in 2016 when it made it legal to use and carry up to an ounce of marijuana.
California began issuing temporary licenses to dispensaries in December that will allow those stores to sell nonmedical marijuana. Those licenses became valid on January 1, 2018.
But that doesn't mean all Californians will be able to buy marijuana at the stroke of midnight. Many cities in the Central Valley, including Fresno, have moved to ban recreational sales.
In 2016, Massachusetts gave residents the green light to carry and use an ounce of marijuana and grow up to 12 plans in their homes. But the future of the state's legal market is hazy.
Lawmakers delayed the opening of pot shops to July 2018, instead of the January 2018 date that voters approved in the election. Until then, there will be no sales of recreational weed.
Residents and tourists who are 21 and over can buy an ounce of marijuana or one eighth of an ounce of edibles or concentrates in Nevada — while supplies last. Less than two weeks after sales of recreational weed began on July 1, 2017, many stores ran out of marijuana to sell.
The state has earned nearly $20 million in marijuana tax revenue since the market launched.
There's bad news if you want to grow your own bud, though. Nevada residentsmust live 25 miles outsidethe nearest dispensary in order to be eligible for a grower's license.
Vermont became the first state to legalize marijuana through the legislature, rather than a ballot initiative, when Republic Governor Phil Scott signed a bill into law on January 22.
Adults in the Green Mountain State will be able to carry up to an ounce of marijuana and grow no more than two plants for recreational use. The new law goes into effect in July. But the bill is limited in scope. It doesn't establish a legal market for production and sale of the drug.