States and cities that have opted to legally regulate adult social use and/or medical use of marijuana:

Marijuana Legalization
(19): Alaska, Arizona, California, Colorado, Connecticut, Illinois, Maine, Massachusetts, Michigan, Montana, Nevada, New Jersey, New Mexico, New York, Oregon, Rhode Island, Vermont, Virginia, Washington.
*Note re Washington, DC: Marijuana is also legal in Washington, DC but DC is not yet a state.
*Note re South Dakota: Voters in the state of South Dakota approved a legalization measure in November 2020 but a circuit court ruled that it's unconstitutional. The South Dakota Supreme Court as of June 30, 2021, the Court is still considering the ruling. The SD State Court Administrator declared that "Until the Court issues an opinion, the ruling of the circuit court declaring Amendment A unconstitutional remains in effect."

Marijuana Decriminalization
(14): Connecticut, Delaware, Maryland, Hawaii, Minnesota, Mississippi, Missouri, Nebraska, New Hampshire, North Carolina, North Dakota, Ohio, Rhode Island

Medical Marijuana Legalization
(35): Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Hawaii, Illinois, Louisiana*, Maine, Maryland, Massachusetts, Michigan, Minnesota*, Mississippi, Missouri, Montana, Nevada, New Hampshire, New Jersey, New Mexico, New York*, North Dakota, Ohio*, Oklahoma, Oregon, Pennsylvania*, Rhode Island, South Dakota, Utah, Vermont, Washington, West Virginia* (also, Washington, DC)

*no smoking allowed

Medical Marijuana Legalization - CBD Oil Only
(14): Alabama, Georgia, Indiana, Iowa, Kansas, Kentucky, Mississippi, North Carolina, South Carolina, Tennessee, Texas, Virginia, Wisconsin, Wyoming

Hemp Legalization*
Hemp is now federally legal. Only two states in the country - Idaho and Mississippi - do not allow cultivation of hemp for commercial, research or pilot programs.

Cities That Have Legalized Marijuana
(5): Breckenridge, CO; Denver, CO; Portland, ME; South Portland, ME; Washington, DC

Cities That Have Decriminalized or Depenalized Marijuana
(57): Albuquerque, NM; Allentown, PA; Ann Arbor, MI; Athens, OH; Atlanta, GA; Austin, TX; Bellaire, OH; Berkeley, CA; Berkley, MI; Chicago, IL; Cincinnati, OH; Cocoa Beach, FL; Columbia, MO; Dayton, OH; Daytona Beach, FL; Detroit, MI; East Lansing, MI; Eau Claire, WI; Ferndale, MI; Flint, MI; Fremont, OH; Grand Rapids, MI; Houston, TX; Huntington Woods, MI; Jackson, MI; Jersey City, NJ; Kansas City, MO; Keego Harbor, MI; Lancaster, PA; Logan, OH; Madison, WI; Miami, FL; Milwaukee, WI; Monona, WI; Mount Pleasant, MI; New Orleans, LA; Newark, OH; Norfolk, VA; Norwood, OH; New York, NY; Oregon, OH; Orlando, FL; Philadelphia, PA; Pittsburgh, PA; Pleasant Ridge, MI; Portage, MI; Port Huron, MI; Roseville, OH; Saginaw, MI; State College, PA; Santa Fe, NM; St. Louis, MO; Tampa, FL; Toledo, OH; Wichita, KS; Windham, OH; York, PA

Cities That Have Made Marijuana Arrests the Lowest Priority
(12): Eureka Springs, AR; Fayetteville, AR; Hailey; ID; Kalamazoo, MI; Oakland, CA; San Francisco, CA; Santa Barbara, CA; Santa Cruz, CA; Santa Monica, CA; Seattle, WA; Tacoma, WA; Tampa, FL; West Hollywood, CA

States That Have Decriminalized Entheogenic Plants (including psilocybin)
(1): Oregon, New Jersey*

*for possessing an ounce or less of mushrooms from a third-degree crime to a disorderly-persons offense

Cities That Have Decriminalized Entheogenic Plants (including psilocybin)
(8): Ann Arbor, MI; Cambridge, MA; Denver, CO; Oakland, CA; Santa Cruz, CA; Somerville, MA; Vancouver, BC; Washington, DC

States That Have Decriminalized Possession of Controlled Substances
(1): Oregon

Nations That Have Legalized Marijuana
(3): Canada, Uruguay, Malta

Nations That Have Decriminalized Possession of Controlled Substances
(1): Portugal