Answer first
There is no federal medical cannabis program. Each state writes its own law. As of 2025, 38 states and the District of Columbia run a medical cannabis program, plus three territories, per the National Conference of State Legislatures. A few other states allow low-THC CBD oil programs. Rules differ on five points: who qualifies, how a patient enrolls, how much a patient can buy, where a patient can buy it, and whether an out-of-state card works.
Medical Cannabis Laws for Minors by State: A Buying Guide
Cannabis stays Schedule I under the federal Controlled Substances Act. State law does not override that. A purchase that follows state rules is still a federal offense.
states where medical cannabis is legal
Qualifying conditions
Most states publish a fixed list. Common entries: cancer, HIV/AIDS, epilepsy, multiple sclerosis, Crohn's disease, glaucoma, PTSD, chronic pain, and terminal illness.
how to get medical card by state
A smaller group lets a physician certify any condition the physician judges treatable. California and Oklahoma use that model. Florida and Pennsylvania require a condition from a fixed list.
Enrollment and ID cards
Steps in most states:
- See a clinician licensed in that state.
- Get a written certification.
- Submit an application to the state cannabis program.
- Pay a fee.
- Receive a patient card.
Renewal runs each year or every two years, based on the state. Not every state requires a card. California patients can buy at a dispensary with a physician recommendation and a government ID. Oklahoma issues a two-year license for $100, with a reduced fee for Medicaid enrollees. Florida charges $75 for the annual card. Fees run from $0 to about $200.
Purchase and possession limits
Limits come in two forms: weight of flower and milligrams of THC. Florida caps smokable flower at 2.5 ounces per 35-day period, and edible doses in Florida max out at 10 mg THC. Other states use a 30-day, 60-day, or 90-day supply figure instead of a weight.
Patients cannot cross state lines with cannabis. Transport across a state border violates federal law.
Home cultivation
Some medical states allow patients to grow. Michigan allows 12 plants for a registered patient. Oklahoma allows six mature plants and six seedlings. Colorado allows six plants, with higher counts under a physician's extended plant count.
Florida, Pennsylvania, New Jersey, and Illinois do not allow patient home grows.
Reciprocity
A few states accept an out-of-state medical card for a dispensary purchase. Examples include Arizona, Nevada, and Maine. Most states do not. A patient who moves should check the new state residency rule and the transfer window for a new card.
Work, housing, and firearms
A medical card does not change federal rules. Federal employees fall under federal drug policy. Federal law bars firearm purchase by a person who uses cannabis, under 18 U.S.C. 922(g)(3), and Form 4473 asks about it.
State job protections vary. Illinois, New York, New Jersey, Arizona, and Minnesota limit an employer's ability to fire a registered patient after a positive test. Other states give employers wide latitude.
Cost and tax
Many states exempt medical cannabis from sales tax. Illinois charges 1% on medical cannabis and up to 25% on recreational products. Shelf prices vary by state, by product type, and by harvest volume.
How to check your state
- Open your state health department cannabis program page.
- Read the qualifying condition list and the fee schedule.
- Confirm the possession limit and the renewal date.
- Ask the dispensary if it takes out-of-state cards.
Rules change. Condition lists, fees, limits, and reciprocity get amended in most legislative sessions. Verify before each renewal.
Federal status
Cannabis remains Schedule I under the Controlled Substances Act. The FDA has approved Epidiolex for two seizure disorders and synthetic THC drugs such as dronabinol. The FDA has not approved smoked cannabis as medicine. DEA proposed moving cannabis to Schedule III in 2024. No final rule had taken effect as of this writing. A congressional appropriations rider blocks the Justice Department from spending funds to stop states from running medical cannabis programs.