Can boxers smoke weed? The commissions, the anti-doping rules and the 2027 change

Can boxers smoke weed? It depends on who is sanctioning the fight. In California, the State Athletic Commission lists cannabinoids among the drugs it tests fighters for. Next door in Nevada, the commission voted in July 2021 to stop disciplining boxers and MMA fighters for cannabis. And in amateur and Olympic-style boxing, World Anti-Doping Agency rules ban THC in competition.

Off the books, the answer in the gym is simpler: nobody should spar high. Here is how the commissions differ, what the anti-doping rules say, what changes on January 1, 2027, and where the sport’s best-known cannabis entrepreneur fits in.

Last reviewed: November 2026.

Can boxers smoke weed under California commission rules?

Professional boxing in the United States is regulated state by state, so the commission for the venue sets the drug rules. The California State Athletic Commission’s FAQ lists cannabinoids among the substances it tests for, alongside stimulants, narcotics, anabolic agents, peptide hormones and masking agents.

Its instructions on medicinal cannabis are blunt. A fighter on any prescription medication, including medicinal marijuana, has to disclose it at licensing or as early in the bout approval process as possible, and send the medical paperwork for a commission physician to review. The FAQ warns in capital letters not to wait until fight week or the weigh-in, because that can get the fight cancelled.

A fighter who skips the disclosure and then tests positive can be suspended, fined, called before the commission, or lose the license. California adult-use law, which lets anyone 21 and over buy cannabis, does nothing to change that.

Nevada changed its mind in 2021

Nevada was once the strictest place to fight. Then, in July 2021, the Nevada State Athletic Commission voted to stop disciplining fighters and boxers for cannabis, Sports Illustrated reported. Senior deputy attorney general Edward Magaw had given the commission the authority in a memo. Testing continued for six months to collect data, and the change was not retroactive. The same report noted that two UFC fighters, Gillian Robertson and Misha Cirkunov, had been suspended for cannabis positives from March 2021 fights in Las Vegas.

The vote did not make it fine to fight high. The fight-night line in that report came from a separate rulebook: UFC executive Jeff Novitzky described the UFC’s own anti-doping policy as reserving discipline for a fighter who is under the influence on fight night. For what the Nevada commission itself allows today, check with the commission.

Anti-doping rules work differently. Under the WADA Code, a THC result above the threshold in an in-competition test can lead to a sanction without any proof that the fighter was impaired in the ring, even if the use was days earlier and out of competition.

What the WADA rules say about cannabis in boxing

World Boxing, which runs the amateur and Olympic side of the sport, adopts the WADA Code and has handed its testing to the International Testing Agency. Under the 2026 Prohibited List, natural and synthetic cannabinoids are banned in competition, with CBD the exception.

USADA’s FAQ fills in the numbers. THC has a urine threshold of 150 ng/mL, measured as carboxy-THC, its main breakdown product; it is a lab threshold, not a personal clearance rule. CBD has been exempt since 2018, according to USADA’s 2018 list summary. The rule applies regardless of the state an athlete lives in. WADA reviewed the cannabis listing in 2022 and, according to USADA, found no rigorous evidence that it enhances performance, but kept it on the list as a health risk and against the spirit of sport. This is general information, not legal advice; check the rules for your own commission and event.

THC is also one of four Substances of Abuse under the Code, with cocaine, heroin and MDMA. If a fighter tests positive in competition but shows the use was out of competition and unrelated to sport, the ban is three months, and it can drop to one month after an approved treatment program.

What changes on January 1, 2027

WADA published its 2027 list on September 21, 2026, and UK Anti-Doping’s summary explains the cannabis change. From January 1, 2027, only THC and the semi-synthetic and synthetic cannabinoids that mimic its psychoactive effects, such as delta-8 THC, delta-10 THC and HHC, stay prohibited in competition. Natural minor cannabinoids such as CBN and CBG come off the list. CBD stays permitted.

The practical effect for a fighter is small. THC is still the substance that matters, and UKAD warns that CBD products can contain enough THC to trigger a positive test, depending on how they were made. A CBD label is no clearance, which answers the common question about CBD for boxing.

Boxers who smoke weed, and boxing while high

The most famous boxer in the cannabis business is Mike Tyson. His Tyson 2.0 flower line launched in Colorado at the end of 2021, 303 Magazine reported that December, and in that coverage Tyson talked openly about his own cannabis use.

For anyone still training, the gym rule is plain. The CDC says recent cannabis use can affect attention, decision-making, coordination and reaction time, which is everything a fighter needs to slip a punch. Do not spar or hit pads with a partner while high, and tell your coach if you are not right.

Outside the gym, California law allows adults 21 and over to buy cannabis but bans consuming it in public, per the DCC. Never drive after using it; the DCC responsible-use page explains why. Effects vary from person to person, and the label is the final word on any product. The same rules come up in tennis and golf, and budtenders at your local Vibe store can help with anything on the menu.

Frequently asked questions

Sources

• California State Athletic Commission: FAQs
• Sports Illustrated: Nevada Athletic Commission will no longer discipline fighters for marijuana (July 7, 2021)
• World Boxing: anti-doping and ITA
• WADA 2026 Prohibited List
• UK Anti-Doping: 2027 Prohibited List summary of changes
• USADA: marijuana FAQ
• USADA: substances of abuse
• 303 Magazine: Mike Tyson launches his first premium cannabis line in Colorado (December 23, 2021)
• CDC: cannabis and brain health
• DCC: what is legal
• DCC: responsible use
• USADA: 2018 Prohibited List, summary of major changes

For adults 21+ (18+ with a physician’s recommendation in California). Keep out of reach of children and pets. Do not drive or operate machinery after use.