A record high 64% of Americans support legalizing marijuana for recreational use, according to a 2017 Gallup Poll. Support for legalization is rooted in changing perceptions of the drug’s potential harm, as well as the prospect of hundreds of millions of dollars in marijuana sales and excise tax revenue for state governments.

The growing acceptance of marijuana among Americans has also been reflected in the ballot box. Currently, eight states and Washington D.C. have legalized recreational marijuana. Pro-pot initiatives passed in eight of the nine states in which they made it to the ballot in November 2016. Voters in Arkansas, Florida, Montana and North Dakota approved or expanded medical marijuana laws in their states. In Maine, Massachusetts, Nevada and California, voters approved recreational pot. Only Arizona’s push for full legalization failed.

1. Arizona
> Possession decriminalized: No
> Amount decriminalized: N/A
> Max. fine for less than 2 lbs.: $150,000
> Annual adult usage: 12.7% (19th highest)

In ballot initiative states, citizens can vote directly on proposed laws. As a result, because politicians who may fear political fallout are out of the equation, states that allow ballot initiatives are much more likely to legalize recreational marijuana use than non-ballot initiative states. Arizona voters in November 2016 struck down Proposition 205, which would have allowed adults in the state to possess up to 1 ounce of marijuana and grow and harvest up to six plants, by a 52.2% to 47.8% margin. Despite the defeat for legalization proponents, other ballot initiative states that have struck down similar propositions in the past — like neighboring California — ultimately legalized pot.

Currently, state residents with dispensary cards suffering from a range of conditions, including PTSD, severe nausea, and cancer, can legally posses as much as 2.5 ounces of marijuana for medicinal use.

All four states that legalized recreational marijuana in 2016 made 24/7 Wall St.’s list of the next states to legalize pot that same year.

Despite widespread acceptance of the drug, only about 21% of the U.S. population live in states or districts that have legalized recreational pot. In all likelihood, the share will only grow in the coming years.

Though every state to legalize pot so far has done so through ballot initiatives, going forward, states have a variety of options for making pot legal. Predicting which states will be next to legalize requires weighing a range of legal circumstances and cultural conditions. 24/7 Wall St. reviewed marijuana usage rates, existing marijuana laws, and legislative processes in each state to identify the states most likely to legalize pot next.

Click here to see the next 15 states to legalize marijuana.
Click here to see our detailed findings and methodology.