As of April 30, 2017, 29 states and the District of Columbia allow its citizens to use medical marijuana. Voters in the states of Colorado, Washington, Alaska, Oregon, California, Maine, Nevada, Massachusetts and the District of Columbia have approved ballot measures to legalize cannabis for adult use.

States that have Legalized Marijuana

StateYear PassedHow PassedPossession Limit
Alaska1998Ballot Measure (58%)1oz usable; 6 plants (3 mature, 3 immature)
Arizona2010Proposition 203 (50.13%)2.5oz usable, 12 plants
Arkansas2016Ballot Measure Issue 6 (53.2%)3oz usable per 14-day period
California1996Proposition 215 (56%)8oz usable; 6 mature or 12 immature plants
Colorado2000Ballot Amendment 20 (54%)2oz usable; 6 plants (3 mature, 3 immature)
Connecticut2012House Bill 5389 (96-51 H, 21-13 S)2.5oz usable
Delaware2011Senate Bill 17 (27-14 H, 17-4 S)6oz usable
Florida2016Ballot Amendment 2 (71.3%)Amount to be determined
Hawaii2000Senate Bill862 (32-18 H; 13-12 S)4oz usable; 7 plants
Illinois2013House Bill 1 (61-57 H; 35-21 S)2.5oz of usable cannabis during a 14-day period
Maine1999Ballot Question 2 (61%)2.5oz usable; 6 plants
Maryland2014House Bill 881 (125-11 H; 44-2 S)30-day supply, amount to be determined
Massachusetts2012Ballot Question 3 (63%)60-day supply for personal medical use (10oz)
Michigan2008Proposal 1 (63%)2.5oz usable; 12 plants
Minnesota2014senate Bill 2470 (46-16 S; 89-40 H)30-day supply of non-smokable marijuana
Montana2004Initiative 148 (62%)1oz usable; 4 plants (mature); 12 seedlings
Nevada2000Ballot Question 9 (65%)2.5oz usable; 12 plants
New Hampshire2013House Bill 573 (284-66 H; 18-6 S)2oz of usable cannabis during a 10-day period
New Jersey2010Senate Bill 119 (48-14 H; 25-13 S)2oz usable
New Mexico2007Senate Bill 523 (36-31 H; 32-3 S)6oz usable; 16 plants (4 mature 12 immature)
New York2014Assembly Bill 6357 (117-13 A; 49-10 S)30-day supply non-smokable marijuana
North Dakota2016Ballot Measure 5 (63.7%)3oz per 14-day period
Ohio2016House Bill 523 (71-26 H; 18-15 S)Maximum on 90-day supply, amount to be determined
Oregon1998Ballot Measure 67 (55%)24oz usable; 24 plants (6 mature, 18 immature)
Pennsylvania2016Senate Bill 3 (149-46 H; 42-7 S)30-day supply
Rhode Island2006Senate Bill 0710 (52-10 H; 33-1 S)2.5oz usable; 12 plants)
Vermont2004Senate Bill 76 (22-7) HB 645 (82-59)2oz usable; 9 plants (2 mature, 7 immature)
Washington1998Initiative 692 (59%)8oz usable; 6 plants
Washington, DC2010Amendment Act B18-622 (13-0 Vote)2oz dried
West Virginia2017Senate Bill 386 (72-24 H; 28-6 S)30-day supply, amount to be determined