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Is Cannabis Legal in the US?

Cannabis is currently illegal under federal law in the United States. But many states have made their own rules for cannabis use. Some states allow cannabis for medical use, some allow it for both medical and recreational use, and others still consider it fully illegal.

How to find your state’s cannabis laws

If you have cancer and you’re using cannabis or thinking about trying it, make sure to check or call your local health department to find details of your state laws. Some things you might want to know include:

  • If cannabis is legalized in your state for medical or recreational use
  • What the rules are for using cannabis in your state
  • How and where to legally buy cannabis through registered dispensaries and sellers in your state
  • If it’s legal to bring cannabis products into your state that were purchased or obtained outside of your state

The following organizations offer maps detailing the cannabis laws adopted by each state:

  • National Conference of State Legislatures offers a
  • Britannica/ProCon provides a

How do cannabis laws vary by state?

Cannabis laws in the US vary widely by state:

  • Some states allow cannabis for medical use only.
  • Other states allow cannabis for both medical and recreational use.
  • Some states have limitations on the types of cannabis products allowed.
  • Each state may have its own definition of “eligible people” or who is considered an “adult,” which affects who can legally use cannabis.
  • Some states have removed or reduced fines and other legal penalties for people who have small amounts of cannabis in their possession.
  • Some states still consider cannabis to be fully illegal. In these states, bringing cannabis from another state, using it, or having it in your possession means you might face criminal charges.

Many states have rules that allow people (usually adults) to use cannabis for medical reasons. To use cannabis legally in these states, you must have a medical problem that has been shown to possibly benefit from cannabis use. You can learn more at Possible Benefits of Cannabis for People with Cancer and Risks of Cannabis Use for People with Cancer.

Certain states require a recommendation from a doctor too. Some states might require having a special card or identification number to buy it from a cannabis dispensary.

In states that allow adults to use cannabis during their leisure time for non-medical reasons, it can usually be bought in dispensaries that have a license to sell it. Each state has rules about how much you can buy at a time. There are also laws about what forms you can use and where you can use them. For example, some states allow edible cannabis to be used in public places, but inhaled or smoked cannabis may not be allowed in certain places.

What does the federal law say about cannabis?

While cannabis laws in the US vary widely by state, cannabis is considered an illegal drug under federal law. The only exception to this is hemp, which is not considered illegal because of its lower amount of THC.

Federal limitations on people who use cannabis

According to federal law, people who use cannabis cannot:

  • Buy and possess a gun or other firearm
  • Get federal housing
  • Get certain types of visas
  • Be employed by the federal government
  • Serve in the military

Traveling with cannabis

Crossing state lines with cannabis products may or may not be allowed under state laws. For example, if cannabis is illegal in a state that is being traveled to, it can be against the law to bring cannabis to that state.

Carrying cannabis while traveling to and from other countries is illegal under federal law except for hemp products.

Workplace policies

Workplace policies on cannabis use and drug testing vary greatly. For example, employers who hire or employ federal workers and contractors are required to include drug testing programs in their policies. For non-federal employees and contractors, details in a workplace cannabis policy depend on where you are employed, what type of job you have, and what your job duties are. Employers must abide by state laws on cannabis use, but this can be hard to do if employees work from home or in offices in other states.

If you are employed and use cannabis or are thinking of using it, check your workplace policy. Here are some things to keep in mind:

  • Even if cannabis is legal in a state, employers that have a drug and alcohol policy can require drug tests on employees that include testing for cannabis.
  • There are no current federal laws that say employers should accept or reject an employee’s use of cannabis, even for medical purposes.

side by side logos for P站视频 and American Society of Clinical Oncology

Developed by the P站视频 medical and editorial content team with medical review and contribution by the American Society of Clinical Oncology (ASCO).

Braun IM, et al. Cannabis and Cannabinoids in Adults With Cancer: ASCO Guideline. Journal of Clinical Oncology. 42(13). March 13, 2024. Available at https://ascopubs.org/doi/10.1200/JCO.23.02596. Accessed on July 11, 2025.

Department of Justice (DOJ)/Drug Enforcement Administration (DEA). Drug Fact Sheet: Marijuana/Cannabis. 2020. Available at https://www.dea.gov/sites/default/files/2020-06/Marijuana-Cannabis-2020_0.pdf. Accessed on July 11, 2025.

Food and Drug Administration (FDA). FDA Regulation of Cannabis and Cannabis-derived Products, Including Cannabidiol (CBD). July 16, 2024. Available at https://www.fda.gov/news-events/public-health-focus/fda-regulation-cannabis-and-cannabis-derived-products-including-cannabidiol-cbd. Accessed on July 11, 2025.

Food and Drug Administration (FDA). What you need to know (and what we’re working to find out) about products containing cannabis or cannabis-derived compounds, including CBD. July 16, 2024. Available at https://www.fda.gov/consumers/consumer-updates/what-you-need-know-and-what-were-working-find-out-about-products-containing-cannabis-or-cannabis. Accessed on July 11, 2025..

National Cancer Institute (NCI). Cannabis and Cannabinoids (PDQ) - Patient Version. August 15, 2023. Available at https://www.cancer.gov/about-cancer/treatment/cam/patient/cannabis-pdq. Accessed on July 11, 2025.

National Institute on Drug Abuse (NIDA). Cannabis (Marijuana). September 2024. Available at https://nida.nih.gov/research-topics/cannabis-marijuana. Accessed on July 11, 2025.

Transportation Security Administration (TSA). What can I bring? Medical marijuana. 2024. Available at https://www.tsa.gov/travel/security-screening/whatcanibring/all. Accessed on July 11, 2025.

Worster B, Hajjar ER, Handley N. Cannabis use in patients with cancer: A clinical review. Journal of Clinical Oncology. June 24, 2022; 18(11): doi.org/10.1200/OP.22.00080.

Last Revised: July 11, 2025

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