The short answer

There is no single national possession limit for medical cannabis. The number that applies to you is written into the law of the state that issued your patient registry card, and it usually appears as a supply window rather than one flat figure. Inside that state, the state limit governs your flower, concentrate, and edible totals. Federal law still lists cannabis as a Schedule I controlled substance, so a state card does not shield you on federal land, at airports, at border crossings, or in most states that did not write a reciprocity rule. Hemp-derived CBD with no more than 0.3 percent THC by dry weight sits under a separate federal framework, which is why a CBD label question and a medical cannabis limit question are not the same question.

cannabis possession limits grams

Who sets the number

Two rule sets overlap, and mixing them up causes most of the confusion you will see in dispensary parking lots and in online forums.

cannabis possession limits for medical patients

State medical cannabis programs

Each state that runs a medical program defines a qualifying supply, the period it covers, who may possess it, and how each product form counts toward the cap. Some states also set a separate daily or per-transaction purchase limit, which is a different number from the possession ceiling. Caregivers often get their own allotment, sometimes stacked on top of the patient total.

Cannabis Possession Limits in Grams: State-by-State Guide

Hemp-derived CBD

Hemp is defined by THC concentration, not by the plant name. Cannabis with 0.3 percent or less THC on a dry weight basis falls under hemp rules, and that threshold is federal. States may still restrict specific hemp products, including delta-8 THC and other intoxicating cannabinoids, so a product that is legal where it was made may not be legal where you live.

Cannabis Possession Limits by State: How Much Is Legal Where You Live

How states count a supply

• Usable flower, often weighed in ounces or grams, with stems and seeds excluded.
• Concentrates and extracts, counted by weight or converted into a flower equivalent.
• Edibles and tinctures, sometimes capped by total THC in milligrams instead of product weight.
• Topicals, which many states exclude from the possession total because they are not intoxicating.
• Home cultivation plants, which are counted separately from the amount you may carry.

Conversion math is where shoppers get surprised. A state that allows three ounces of flower may treat one gram of concentrate as equal to several grams of flower. The ratio is set by statute or by the state regulator, and it changes when rules are updated.

What to look for before you carry or buy

• Your state's current possession cap, the window it covers, and whether it counts THC instead of plant weight.
• Whether the cap covers each product form separately or all forms combined.
• Reciprocity rules if you travel. Most states do not honor another state's card.
• Original dispensary packaging and your registry card or ID on hand.
• For hemp CBD: a batch-specific certificate of analysis, a lot number that matches the bottle, and a THC value reported with a clear limit of quantification.
• An accredited third-party lab on the report, plus a contaminant panel covering pesticides, heavy metals, residual solvents, and microbials.

Typical parameter bands

These are broad ranges drawn from state rules and hemp labeling practice. Your state's statute always wins over any general figure you read online.

• Flower caps: commonly one to three ounces per supply window, with a few states outside that band.
• Windows: 14, 30, 60, or 90 days, with 30 and 90 the most common.
• THC-equivalent caps: some states skip plant weight and cap total THC in grams per window instead.
• Concentrate conversion: often one gram of concentrate equals three to five grams of flower, though the factor differs by state.
• Hemp THC ceiling: 0.3 percent or less on a dry weight basis to stay under federal hemp rules.
• Label reporting: look for THC stated to 0.1 percent or finer, with not detected shown for products that test clean.
• Serving size: check milligrams of CBD per serving and servings per container, since those numbers drive how long a bottle lasts.

Pitfalls

• Assuming a medical card travels with you. In most states it does not, and the host state's limit applies if you qualify there at all.
• Treating a purchase limit as a possession limit. They are separate numbers in many statutes.
• Buying delta-8 or THC-O products labeled as hemp without checking your state's banned list.
• Trusting a THC-free claim with no certificate of analysis, or a report that lists a different batch than the one you hold.
• Carrying loose product without the original label, which makes it hard to show what it is and how much it contains.
• Forgetting that federal property, national parks, and airport security follow federal rules regardless of state law.

FAQ

Does my medical cannabis card work in another state?

Sometimes, but not often. A handful of states allow visiting patients or offer reciprocity, and even then you follow the host state's possession limits, product rules, and purchase caps. Verify before you travel rather than after.

Do possession limits include CBD?

Hemp-derived CBD with 0.3 percent THC or less is generally handled under hemp rules rather than medical cannabis rules. State restrictions on specific cannabinoids still apply, and full-spectrum products can carry trace THC that shows up on a lab report.

How do I know how much THC is in a CBD bottle?

Read the certificate of analysis for the exact lot number on your container. It should list total THC, the test method, and the reporting limit. If the report has no lot match, the number does not describe your bottle.

Are edibles counted the same as flower?

Not in most states. Edibles and tinctures are frequently capped by total THC in milligrams, while flower is capped by weight. Some states combine everything into one THC-equivalent total instead.

What happens if I exceed the limit?

Penalties depend on the state, the amount over the cap, and whether the product was in original packaging. Overages can turn a compliant patient situation into a criminal one, so track your totals by form.