Here's where you can legally consume marijuana in the US in 2018

The United States is gradually becoming the land of the red, white, and green.

Nine states and Washington, DC, have legalized marijuana for recreational use for adults over the age of 21. Medical marijuana is legal in another 30 states after voters in Oklahoma approved a ballot initiative to legalize medical marijuana in June.

Support for the drug reached new highs in 2018. A Gallup poll showed that 64% of Americans favor legalization, and even a majority of Republicans back it.

Legal marijuana sales exploded to $9.7 billion in North America in 2017, according to a report from Arcview Market Research and BDS Analytics. That represents a 33% increase over 2016, shattering previous expectations about how quickly the marijuana industry could grow in the face of federal prohibition. By 2022, Arcview expects global spending on legal cannabis to hit $32 billion by 2022, representing a 22% growth rate over the four-year period.

Here's a summary of where Americans can legally light up — no doctor's letter required — in 2018.

​​​​​​See Also:

SEE ALSO: This map shows every state that has legalized marijuana

SEE ALSO: Lebanon will legalize growing marijuana after McKinsey evaluated it as a boost for the country's troubled economy