This map shows every state that has legalized marijuana

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Skye Gould/Business Insider

  • Recreational marijuana is legal in nine states and medical marijuana is legal in 29 states.
  • A 2017 Gallup poll showed that 64% of Americans support legalization.
  • Marijuana enthusiasts will light up on April 20, a marijuana holiday also known as 420.

On April 20, many Americans who smoke marijuana – from California to Maine to Alaska – will light up legally in celebration of “420,” an unofficial marijuana holiday.

Nine states and Washington, DC, have legalized marijuana for recreational use – no doctor’s letter required – for adults over the age of 21. Medical marijuana is legal in another 29 states.

In January, Vermont became the first state to legalize marijuana through the legislature, rather than a ballot initiative, when the governor signed the bill into law.

Marijuana prohibition began 80 years ago when the federal government put a ban on the sale, cultivation, and use of the cannabis plant. It remains illegal on the federal level.

Despite the efforts of Attorney General Jeff Sessions, who has been on a crusade to stamp out legal marijuana since his appointment, the industry is exploding.

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.

The report also predicted the legal marijuana market will reach $24.5 billion in sales – a 28% annual compound growth rate – by 2021, as more state-legal markets come online.

Support for marijuana legalization reached new highs in 2017. A Gallup poll showed that 64% of Americans favor legalization, and a majority of Republicans back it for the first time.