Quick answer

State cannabis law splits into two labels. Adult-use states let anyone 21 and older buy cannabis. Medical states limit sales to patients who hold a doctor certification and a state card. As of 2025, 24 states and the District of Columbia allow adult-use sales. 38 states run medical programs. Several states run both.

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All of these programs sit under one federal rule. Cannabis is Schedule I under the Controlled Substances Act. State laws do not override it.

Medical Cannabis Legal States Map with Reciprocity

Adult-use states

Adult-use states license retailers, growers, and processors. A customer shows an ID that proves age 21. No doctor note, no state card, no qualifying condition.

which states have legalized cannabis in 2025

Possession caps range from 1 ounce to 2.5 ounces of flower. California allows 28.5 grams. Michigan allows 2.5 ounces. Colorado allows 1 ounce. Concentrates and edibles carry separate caps measured in grams of THC.

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Home grow rules vary. Colorado allows 6 plants per adult and 12 per household. Illinois allows home grow for medical patients, not for adult-use customers.

Medical states

Medical states require a physician certification. The patient pays a state fee, often $25 to $200, and gets a card. Each state publishes a qualifying condition list. Common entries are cancer, epilepsy, glaucoma, chronic pain, and PTSD.

Patient limits run higher than adult-use limits. Michigan medical patients may hold 10 ounces. California medical patients may hold 8 ounces. Colorado medical patients may grow 12 plants.

A medical card lowers cost in states that run both programs. Medical cannabis carries no excise tax in several states, and some states charge no sales tax on it.

Taxes

Adult-use sales carry excise tax plus sales tax. Colorado charges a 15% excise tax and a 15% state sales tax. Michigan charges a 10% excise tax and a 6% sales tax. Illinois sets tax by THC content: 10% for flower under 35% THC, 20% for flower above that mark, and 25% for concentrates. Illinois medical patients pay 1%.

Federal status

The DEA proposed moving cannabis to Schedule III in May 2024. The rule is not final. Federal law blocks interstate shipment of cannabis, even between two adult-use states. Banks and card networks handle cannabis money under limits, so many stores take cash.

Card reciprocity

A small number of states accept a medical card from another state. Arizona, Maine, and Oklahoma are examples. California and Colorado do not. A patient who carries cannabis into a medical-only state without a valid card breaks that state's law.

Where to check current rules

State counts change each election. Verify age limits, possession caps, and tax rates with the state cannabis regulator before you buy or travel.