Under federal law, you cannot legally own a gun if you smoke weed, even if marijuana is legal in your state and even if you hold a medical marijuana card. The Gun Control Act bars any regular user of a federally controlled substance from possessing or buying firearms, and marijuana remains a Schedule I controlled substance nationally. A January 2026 ATF rule narrowed who counts as a prohibited “user,” and a Fifth Circuit ruling has carved out an exception in three states, but the underlying ban is still in force.
Why Federal Law Bans Marijuana Users From Owning Guns
The prohibition sits in 18 U.S.C. § 922(g)(3), which makes it a crime for anyone who is an unlawful user of, or addicted to, a controlled substance to ship, transport, receive, or possess a firearm or ammunition.1Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Marijuana is listed under the Controlled Substances Act as Schedule I, alongside heroin and LSD.2Office of the Law Revision Counsel. 21 USC 812 – Schedules of Controlled Substances There is no federal prescription for it. Any use is unlawful use under federal law.
State legalization doesn’t override this. Federal law makes no distinction between recreational use in a legal state, medical use with a state-issued card, or occasional edibles. All of it counts.
What Counts as a “User” After the 2026 ATF Rule
In January 2026, the ATF published an interim final rule that changed how it decides whether someone qualifies as an unlawful user for firearm purposes.3Federal Register. Revising Definition of Unlawful User of or Addicted to Controlled Substance Under the old approach, a single failed drug test, one marijuana possession conviction, or one admission of use within the past year could support a denial. That is no longer the case.
The revised definition requires regular use of a controlled substance over an extended period of time, with that use continuing into the present. Isolated or sporadic use no longer qualifies, and someone who has stopped is not a current user. The ATF estimated that more than 4,200 firearm transfer denials in fiscal year 2025 were based on the kind of single-incident evidence the new rule no longer supports.3Federal Register. Revising Definition of Unlawful User of or Addicted to Controlled Substance
What has not changed: if you use marijuana regularly and continue to do so, you are a prohibited person under federal law.
Buying From a Dealer: Form 4473
Every purchase from a licensed dealer requires you to complete ATF Form 4473. Question 21.e asks whether you are an unlawful user of, or addicted to, marijuana or any other controlled substance, and the form carries a bold warning that marijuana use is still unlawful under federal law regardless of state legalization.4Reginfo.gov. Firearms Transaction Record
Answer “yes” and the sale stops. Answer “no” while you are actively using marijuana and you have committed a separate federal felony: making a false statement on the form, punishable by up to 10 years in prison.5Bureau of Alcohol, Tobacco, Firearms and Explosives. Federal Prosecutors Aggressively Pursuing Those Who Lie in Connection With Firearm Transactions The ATF and Department of Justice have publicized multiple prosecutions of buyers who falsely denied drug use on the form.6United States Department of Justice. US Attorney and ATF Target Those Who Lie-And-Try to Purchase Firearms
Private Sales and Guns You Already Own
Skipping the dealer doesn’t fix the problem. Federal law makes it illegal for any person, not just licensed dealers, to sell or give a firearm to someone they know or have reason to believe is an unlawful user of a controlled substance.1Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts If a friend sells you a gun knowing you smoke, both of you face federal exposure: the seller for an unlawful transfer, you for possession as a prohibited person.
The possession ban also applies to guns you already own. If you legally bought a firearm years ago and later started using marijuana, keeping the gun while you use is a federal offense. The prohibition attaches to your status as a user, not to how you got the weapon.
Medical Marijuana Cards
A medical marijuana card creates a specific problem at the counter. In 2011, the ATF sent an open letter to all licensed dealers telling them that a medical marijuana card gives the dealer “reasonable cause to believe” the cardholder is an unlawful user of a controlled substance.7Bureau of Alcohol, Tobacco, Firearms and Explosives. Open Letter to All Federal Firearms Licensees Under that guidance, the dealer must refuse the sale even if you answer “no” on Form 4473.
The Ninth Circuit upheld the policy in Wilson v. Lynch (2016), ruling that the plaintiff had no constitutional right to hold a medical marijuana card and buy a firearm at the same time.8Justia Law. Wilson v. Lynch, No. 14-15700 (9th Cir. 2016) That decision applied a legal test the Supreme Court has since replaced with the historical-tradition standard from Bruen, so its reasoning is unstable, but the ATF guidance has not been withdrawn.9Supreme Court of the United States. New York State Rifle and Pistol Association, Inc. v. Bruen
Medical cards can also affect state concealed carry permits. Some states use the same federal “unlawful user” standard to deny or revoke permits, and some cross-reference medical marijuana registries. The specifics vary by state.
Court Challenges: Bruen and Daniels
The Supreme Court’s 2022 Bruen decision requires gun regulations to be consistent with the nation’s historical tradition of firearm regulation.9Supreme Court of the United States. New York State Rifle and Pistol Association, Inc. v. Bruen That test has opened the door to challenges against the marijuana-firearms ban.
The biggest so far is United States v. Daniels, decided by the Fifth Circuit in January 2025. The court reversed the conviction of a marijuana user prosecuted for firearm possession, holding that “disarming individuals solely for their prior, occasional, or habitual marihuana use” is inconsistent with the nation’s historical tradition of gun regulation.10United States Court of Appeals for the Fifth Circuit. United States v. Daniels, No. 22-60596 The statute wasn’t struck down, but it couldn’t be applied on those facts. The government has asked the Supreme Court to review the case, and as of mid-2025 it remains pending. A related Fifth Circuit case, United States v. Connelly, found no historical justification for disarming “a sober citizen not presently under an impairing influence.”
These rulings bind only federal courts in Texas, Louisiana, and Mississippi. Everywhere else, the ban is fully enforceable. Betting on Daniels outside the Fifth Circuit means betting on a case that has not yet reached the Supreme Court while facing real criminal exposure.
Criminal Penalties
A marijuana user caught with a firearm can face two separate federal charges:
- Possession of a firearm as a prohibited person under 18 U.S.C. § 922(g) carries a maximum of 15 years in federal prison. The Bipartisan Safer Communities Act of 2022 raised the cap from 10 years.11Office of the Law Revision Counsel. 18 US Code 924 – Penalties
- A false statement on Form 4473 is a separate felony punishable by up to 10 years.5Bureau of Alcohol, Tobacco, Firearms and Explosives. Federal Prosecutors Aggressively Pursuing Those Who Lie in Connection With Firearm Transactions
Any firearm involved in a possession violation is also subject to federal seizure and forfeiture. Once forfeited, you do not get it back.11Office of the Law Revision Counsel. 18 US Code 924 – Penalties
Getting Your Gun Rights Back After Quitting
The 2026 ATF rule gives the clearest guidance to date. A person who has “ceased regularly unlawfully using” a controlled substance is no longer an unlawful user and no longer prohibited from possessing firearms.3Federal Register. Revising Definition of Unlawful User of or Addicted to Controlled Substance
There is no bright-line waiting period. The rule doesn’t set a number of days or months you have to be clean. The standard is whether your use was regular and whether it continues into the present. Daily use that stopped last week sits in a different place than use that stopped six months ago. The old inference that any use within the past year counted is gone, but what replaces it is a judgment call rather than a fixed timeline.
If you want to buy a firearm, you need to be able to honestly answer “no” to question 21.e. That means genuinely stopping, not pausing. Surrendering a medical marijuana card before attempting a purchase also removes the automatic red flag the 2011 ATF letter created for licensed dealers.7Bureau of Alcohol, Tobacco, Firearms and Explosives. Open Letter to All Federal Firearms Licensees
One boundary worth naming: the Department of Justice proposed reclassifying marijuana from Schedule I to Schedule III in 2024, but as of early 2026 no final rule has been issued and marijuana remains Schedule I. Rescheduling has not changed the answer for any current marijuana user.