Now that voters in four states – New Jersey, Montana, Arizona, and South Dakota – approved recreational marijuana, and voters in one state – Mississippi – approved medical marijuana sales, expect more states to follow, experts say.

“This indicates that people are frustrated with the outdated drug policies from the 1970s,” Mason Marks, a law professor at Gonzaga University and a fellow in residence at Harvard Law School’s Petrie-Flom Center for Health Law Policy, told ABC News.

In fact, governors in New York, Pennsylvania, Rhode Island, Connecticut and Virginia have started seriously considering legalizing adult-use cannabis in 2021.