Marijuana laws
Marijuana use among drivers is a growing concern amid a changing legal landscape. Read more on our main alcohol and drugs page.
This material has been prepared for general information purposes only. It is not guaranteed to be current and should be independently verified. Do not rely on it when considering how a law may apply to your circumstances.
April 2024
| State | Type of law | Age restrictions | Possession limits | Retail recreational sales allowed |
|---|---|---|---|---|
| Alabama | medical; effective May 17, 2021 | if under age 19, cannot purchase or possess medical cannabis and cannot use medical cannabis with more than 3% THC | no more than 70 daily dosages, as determined by a physician, which may not exceed 50 mg of delta-9-tetrahydrocannabinol unless a greater amount is deemed medically necessary | |
| Alaska | medical; effective June 1, 1999 | none | no more than 1 ounce | |
| recreational; effective February 24, 2015 | if under age 21, not allowed to purchase, possess, or use | no more than 1 ounce | October 29, 2016 | |
| Arizona | medical | none | no more than 2.5 ounces | |
| recreational; effective November 30, 2020 | if under age 21, not allowed to purchase, possess, or use | no more than 1 ounce, of which not more than 5 grams can be cannabis concentrate | January 22, 2021 | |
| Arkansas | medical; effective November 9, 2016 | if under age 21, cannot smoke medical cannabis | no more than 2.5 ounces | |
| California | medical; effective November 6, 1996 | none | no more than 8 ounces unless a greater amount is deemed medically necessary | |
| recreational; effective November 9, 2016 | if under age 21, not allowed to purchase, possess, or use | no more than 28.5 grams of cannabis not in the form of concentrated cannabis and no more than 8 grams of concentrated cannabis | January 1, 2018 | |
| Colorado | medical; effective June 1, 2001 | if under age 18, cannot smoke medical cannabis when on school grounds, on a school bus, or at a school-sponsored event | no more than 2 ounces unless a greater amount is deemed medically necessary | |
| recreational; effective December 10, 2012 | if under age 21, not allowed to purchase, possess, or use | no more than 2 ouncesFootnote 1 | January 1, 2014 | |
| Connecticut | medical; effective October 1, 2012 | if under age 18, may not grow cannabis plants or smoke medical cannabis | no more than 5 ounces | |
| recreational; effective July 1, 2021 | if under age 21, not allowed to purchase, possess, or use | no more than 1.5 ounces of cannabis; within the person's residence, locked glove box, or vehicle trunk, no more than 5 ounces | January 10, 2023 | |
| Delaware | medical; effective July 1, 2011 | if under age 18, may use only medical cannabis oil and only for certain debilitating conditions and symptoms | no more than 6 ounces | |
| recreational; effective April 23, 2023 | if under age 21, not allowed to purchase, possess, or use | no more than 1 ounce of cannabis, 12 grams of concentrated cannabis, or 750 milligrams of delta-9-tetrahydrocannabinol contained in cannabis products | yes; date not specified 4/7/2023 12:00:00 AM | |
| District of Columbia | medical; effective in 2009 | if under age 21, must have a signed recommendation from an authorized practitioner; if age 21 or older, may self-certify that cannabis is for medical purposes | no more than 8 ounces | |
| recreational; effective February 26, 2015 | if under age 21, not allowed to purchase, possess, or use | no more than 2 ounces | not allowed | |
| Florida | medical; effective March 25, 2016 | none | 70-day supply or 4 ounces in a form for smoking unless a greater amount is deemed medically necessary | |
| Georgia | limited medical; April 16, 2015 | none | no more than 20 fluid ounces of specified cannabis product that contains no more than 5% THC | |
| Hawaii | medical; effective June 14, 2000 | none | no more than 4 ounces | |
| Idaho | no law | n/a | n/a | |
| Illinois | medical; effective January 1, 2014 | if under age 18, may have ID card only for seizures or as provided by administrative rule; if under age 21, may use only medical cannabis-infused products | no more than 2.5 ounces unless a greater amount is deemed medically necessary | |
| recreational; effective January 1, 2020 | if under age 21, not allowed to purchase, possess, or use | no more than 30 grams of cannabis flower, 500 milligrams of THC contained in cannabis-infused product, and 5 grams of cannabis concentration | January 1, 2020 | |
| Indiana | limited medical; April 26, 2017 | none | specified cannabis product that contains no more than 0.3% THC | |
| Iowa | limited medical; effective July 1, 2014 | none | no more than 4.5 grams in a 90-day period unless a greater amount is deemed medically necessary | |
| Kansas | limited medical; effective July 1, 2019 | none | specified cannabis product that contains no more than 5% THC relative to the cannabidiol concentration in the preparation | |
| Kentucky | medical; effective January 1, 2025 | if under age 18, may not purchase or possess medical cannabis and requires assistance from caregiver to use (effective 01/01/25) | no more than 10-day supply on person and, unless a greater amount is deemed medically necessary, no more than 30-day supply of medical cannabis or equivalent raw plant material secured in residence (effective 01/01/25) | |
| Louisiana | medicalFootnote 2 | if under age 21, cannot obtain raw or crude cannabis without a physician's recommendation | 1 month supply | |
| Maine | medical; effective December 22, 1999 | none | up to 2.5 ounces | |
| recreational; effective January 30, 2017 | if under age 21, not allowed to purchase, possess, or use | up to 2.5 ounces | October 9, 2020 | |
| Maryland | medical; effective June 1, 2011 | if under age 21, may not grow cannabis plants; if under age 18, may acquire cannabis only through caregiver or qualified school official | no more than 120 grams of usable cannabis or 36 grams of delta-9-tetrahydrocannabinol contained in cannabis products | |
| recreational, effective July 1, 2023 | if under age 21, not allowed to purchase, possess, or use | no more than 1.5 ounces of usable cannabis, 12 grams of concentrated cannabis, or 750 milligrams of delta-9-tetrahydrocannabinol contained in cannabis products | July 1, 2023 | |
| Massachusetts | medical; effective January 1, 2013 | none | no more than 60-day supply, up to 10 ounces or as determined by the cannabis control commission | |
| recreational; effective December 15, 2016 | if under age 21, not allowed to purchase, possess, or use | no more than 1 ounce; within the person's primary residence, no more than 10 ounces | November 20, 2018 | |
| Michigan | medical; effective December 4, 2008 | none | no more than 2.5 ounces | |
| recreational; effective December 6, 2018 | if under age 21, not allowed to purchase, possess, or use | no more than 2.5 ounces; within the person's residence, no more than 10 ounces | December 1, 2019 | |
| Minnesota | medical; effective May 30, 2014 | none | no more than 90-day supply (effective 03/01/25) | |
| recreational; effective August 1, 2023 | if under age 21, not allowed to purchase, possess or use | no more than 2 ounces of cannabis flower, 8 grams of concentrate and 800 milligrams of edible product (including lower-potency hemp-derived product) | projected to start in the first quarter of 2025 | |
| Mississippi | medical; effective February 2, 2022 | none | no more than 3.5 ounces of cannabis flower, 1 ounce of cannabis concentrate, or 2.8 grams of THC contained in cannabis-infused productsFootnote 3 | |
| Missouri | medical; effective December 6, 2018 | if under age 18 and not emancipated, may not have an ID card nor purchase nor possess cannabis | at least 60-day supply, although qualifying patients who can cultivate cannabis may possess up to 90-day supply | |
| recreational, effective December 8, 2022 | if under age 21, not allowed to purchase, possess, or use | no more than 3 ounces; more allowed within the residence if person is registered for cultivation and keeps the excess in a locked space | February 6, 2023 | |
| Montana | medical; effective November 2, 2004 | if under age 18, cannot smoke medical cannabis and can only use cannabis-infused products | up to 1 ounce | |
| recreational; effective January 1, 2021 | if under age 21, not allowed to purchase, possess, or use | no more than 1 ounce, of which not more than 8 grams may be cannabis concentrate; the amount of THC contained in edible cannabis products to be consumed in solid form may not exceed 800 milligrams | January 1, 2022 | |
| Nebraska | no law | n/a | n/a | |
| Nevada | medical; effective by late November or early December 2000 | none | no more than 2.5 ounces in any 14-day period unless a greater amount is deemed medically necessary | |
| recreational; effective January 1, 2017 | if under age 21, not allowed to purchase, possess, or use | no more than 1 ounce | July 1, 2017 | |
| New Hampshire | medical; effective July 23, 2013 | none | no more than 2 ounces | |
| New Jersey | medical; effective October 1, 2010 | none | no more than 3 ounces in a 30-day period unless a greater amount is deemed medically necessary | |
| recreational; effective January 1, 2021 | if under age 21, not allowed to purchase, possess, or use | no more than 1 ounce | April 21, 2022 | |
| New Mexico | medical; effective July 1, 2007 | none | 3-month supply | |
| recreational; effective June 29, 2021 | if under age 21, not allowed to purchase, possess, or use | no more than 2 ounces of cannabis, 16 grams of cannabis extract, and 800 milligrams of edible cannabis outside the residence | April 1, 2022 | |
| New York | medical; effective July 5, 2014 | none | no more than 60-day supply of the dosage determined by practitioner; within the person's private residence, no more than 5 pounds of cannabis | |
| recreational; effective March 31, 2021 | if under age 21, not allowed to possess | no more than 3 ounces of cannabis and 24 grams of concentrated cannabis; within the person's private residence, no more than 5 pounds of cannabis | December 29, 2022 | |
| North Carolina | limited medical; effective July 13, 2014 | none | specified cannabis product that contains no more than 0.9% THC | |
| North Dakota | medical; effective April 17, 2017 | if under age 19, may use only "pediatric medical marijuana", which contains no more than 6% THC | no more than 3 ounces unless an amount up to 7.5 ounces is deemed medically necessary | |
| Ohio | medical; effective September 8, 2016 | none | no more than 90-day supply | |
| recreational; effective December 7, 2023 | if under age 21, not allowed to purchase, possess, or use | no more than 2.5 ounces not in the form of adult extract and no more than 15 grams of adult extract | pending regulations, which are due within 9 months of the effective date | |
| Oklahoma | medical; effective July 26, 2018 | none | no more than 72 ounces of edible cannabis, 3 ounces of cannabis on the person, 8 ounces of cannabis in the residence, and 1 ounce of concentrated cannabis | |
| Oregon | medical; effective December 3, 1998 | if under age 18, cannot produce medical cannabis | no more than 24 ounces | |
| recreational; effective December 4, 2014 | if under age 21, not allowed to purchase, possess, or use | no more than 8 ounces of usable cannabis, 16 ounces of cannabinoid products in solid form, 72 ounces of cannabiniod products in liquid form, and 16 ounces of cannabinoid concentrates | October 1, 2015 | |
| Pennsylvania | medical; effective May 17, 2016 | none | no more than 30-day supply | |
| Rhode Island | medical; effective July 1, 2006 | none | no more than 2.5 ounces and an amount of wet cannabis as determined by the departments of health and business regulation | |
| recreational; effective May 25, 2022 | if under age 21, not allowed to purchase, possess, or use | no more than 1 ounce of cannabis or the equivalent amount of cannabis concentrate; within the person's residence, no more than 10 ounces | December 1, 2022 | |
| South Carolina | limited medical; effective June 2, 2014 | none | specified cannabis product that contains no more than 0.9% THC | |
| South Dakota | medical; effective July 1, 2021 | if under age 21, cannot smoke medical cannabis | no more than 3 ounces | |
| Tennessee | limited medical; effective May 16, 2014 | none | specified cannabis product that contains less than 0.9% THC | |
| Texas | limited medical; effective June 1, 2015 | none | specified cannabis product that contains no more than 1% THC | |
| Utah | medical; effective May 8, 2018Footnote 4 | if under age 18, may only qualify for a provisional patient card | legal dosage limit sufficient to provide 30 days of treatment and may not exceed 113 grams of unprocessed cannabis or an amount of cannabis product that contains no more than 20 grams of total composite THC | |
| Vermont | medical; effective July 1, 2004 | none | no more than 2 ounces | |
| recreational; effective July 1, 2018 | if under age 21, not allowed to purchase, possess, or use | no more than 1 ounce | October 1, 2022 | |
| Virginia | medical; effective July 1, 2021 | none | more than one cannabis product (cannabidiol oil or botanical cannabis) may be dispensed at a time; no more than 4 ounces of botanical cannabis per 30-day period | |
| recreational; effective July 1, 2021 | if under age 21, not allowed to purchase, possess, or use | no more than 1 ounce of cannabis or an equivalent amount of cannabis product | January 1, 2024 | |
| Washington | medical; December 3, 1998 | if under age 18, may not grow cannabis plants or purchase cannabis-infused products, useable cannabis, or cannabis concentrates from a cannabis retailer | no more than 48 ounces of cannabis-infused product in solid form, 3 ounces of useable cannabis, 216 ounces of cannabis-infused product in liquid form, or 21 grams of cannabis concentrates unless a greater amount is deemed medically necessary, | |
| recreational; effective December 6, 2012 | if under age 21, not allowed to purchase, possess, or use | no more than 1 ounce of useable cannabis, 16 ounces of cannabis-infused product in solid form; 72 ounces of cannabis-infused product in liquid form, and 7 grams of cannabis concentrate | July 8, 2014 | |
| West Virginia | medical; effective July 1, 2019 | none | no more than 30-day supply | |
| Wisconsin | limited medical; effective April 17, 2014 | none | specified cannabis product in a form without a psychoactive effect | |
| Wyoming | limited medical; effective July 1, 2015 | none | specified cannabis product that contains less than 0.3% THC |