Quick answer
Five factors decide if medical cannabis is right for you: your state's qualifying condition list, your medical diagnosis, your current medications, your age, and your doctor's evaluation. If your state does not list your condition, or if you take drugs that interact with cannabis, medical cannabis may not be a safe option.
1. Your state's qualifying condition list
Each US state sets its own list. As of 2024, 38 states and the District of Columbia run medical cannabis programs. Common qualifying conditions include cancer, HIV/AIDS, epilepsy, multiple sclerosis, chronic pain, PTSD, and glaucoma. Some states add Crohn's disease, Parkinson's disease, or terminal illness. Check your state health department list. A condition that qualifies in California may not qualify in Texas.
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2. Your medical diagnosis and history
Your doctor needs a documented diagnosis. The diagnosis must come from a treating physician, not a dispensary employee. Bring records: imaging, lab results, prescription history, and specialist notes. A history of psychosis, schizophrenia, or cannabis use disorder changes the risk. The doctor may deny certification.
3. Current medications and interactions
Cannabis interacts with several drug classes. Examples: warfarin and other blood thinners, benzodiazepines, opioids, and some antidepressants. CBD can raise levels of drugs processed by liver enzymes CYP3A4 and CYP2C19. Tell your doctor every drug, supplement, and herbal tea. An interaction can cause bleeding, sedation, or liver injury.
4. Age and legal status
Most states require age 18 or older for a medical card. Some states allow minors with a caregiver and two physician signatures. You must be a resident of the state. A federal drug felony may block a card in some states. Check your state rules.
5. Route, dose, and product form
Medical cannabis comes as flower, oil, tincture, capsule, edible, topical, and inhaler. Your condition and job affect the route. Inhalation acts in minutes. Edibles take 1 to 3 hours. A doctor may recommend a starting dose of 2.5 mg THC or less. Keep a log of dose, time, and effect.
6. Cost, access, and insurance
Insurance does not cover medical cannabis in most US states. You pay out of pocket. A state card costs $25 to $200 per year. An ounce of flower costs $150 to $400. A dispensary must be within driving distance. Home delivery is not legal in every state.
7. Work, travel, and legal risk
Employers can fire or refuse to hire you for a positive cannabis test, even with a state card. Federal jobs, commercial driving, and some health care jobs have zero tolerance. Do not cross state lines with cannabis. Federal law classifies cannabis as a Schedule I drug.
8. Pregnancy, breastfeeding, and mental health
The CDC advises against cannabis use during pregnancy and breastfeeding. THC passes to the fetus and breast milk. Cannabis can worsen anxiety, paranoia, and depression in some people. A family history of schizophrenia raises risk. Discuss these points with your doctor.
9. Cannabis use disorder risk
About 3 in 10 people who use cannabis develop cannabis use disorder. Risk rises with daily use, high THC products, and starting before age 18. Signs include tolerance, withdrawal, and failed attempts to cut down. If you have these signs, medical cannabis may not be right for you.
10. Doctor certification and renewal
A licensed physician must certify your condition. The visit takes 15 to 30 minutes. You need a photo ID, medical records, and payment. The card lasts 1 year in most states. Renewal requires another visit. Some states allow telehealth. Others require in-person exams.
Checklist before you apply
- Confirm your condition is on your state list.
- Gather records from your treating doctor.
- List every medication and supplement.
- Review mental health and addiction history.
- Check your employer's drug policy.
- Calculate annual cost: card, product, travel.
- Ask your doctor about interactions.
When medical cannabis is not right
Skip medical cannabis if your state does not list your condition. Skip it if you take a drug that interacts. Skip it if you are pregnant or breastfeeding. Skip it if you have a history of psychosis or cannabis use disorder. Skip it if your job requires a federal clearance. Your doctor can suggest other treatments.