Is weed banned in the Olympics? In competition, yes. Cannabis Olympics rules come from the World Anti-Doping Code, which prohibits THC and other cannabinoids during competition, while CBD on its own has been allowed since 2018. Athletes can still fail a test after using a CBD product that contains THC. Here is how the rules work, the cases that changed the conversation, what research says about performance, and how to enjoy the Games as a fan, legally and responsibly.
Cannabis and elite sport: drug-war stigma and shifting attitudes
For decades, cannabis in sport was treated mostly as a moral and legal problem. Before the World Anti-Doping Agency existed, the International Olympic Committee's medical commission oversaw doping control. Since 2004, when WADA took charge of the prohibited list, cannabinoids have been banned in all sports during competition. The code weighs three criteria when deciding what to ban: potential to enhance performance, risk to the athlete's health and whether use goes against the "spirit of sport."
Cannabis was never a fringe issue in testing. According to a 2011 review co-written by WADA scientists, cannabinoids made up 12.5% to 13.9% of the positive findings the IOC reported between 1998 and 2003. After the 2004 code took effect, their share of positive findings fell from 15.7% in 2004 to 7.7% in 2009, though cannabinoids still ranked among the most reported prohibited substances.
Attitudes shifted as more places legalized cannabis, but sport did not move as one. Professional leagues set their own policies, and their thresholds and penalties vary widely; our look at cannabis in sports covers league rules. The Olympics follow WADA's code.
What the anti-doping code bans and allows: THC in competition, CBD permitted
| Substance | In competition | Out of competition |
|---|---|---|
| THC | Prohibited above the urine threshold | Not prohibited |
| CBD (cannabidiol) | Permitted since January 1, 2018 | Permitted |
| Other natural cannabinoids, such as CBG, CBN and CBC | Prohibited in any amount | Not prohibited |
| Synthetic cannabinoids, such as K2 or Spice | Prohibited | Not prohibited |
Under the 2021 code, THC counts as a "substance of abuse." An athlete who can show the use happened out of competition and was unrelated to sport performance faces a three-month ban, which can drop to one month after completing an approved substance-of-abuse program. Our guide to cannabinoids explains how CBD, CBG and CBN differ.
Testing thresholds and why some CBD products can still cause a positive test
WADA sets a urine threshold for THC, measured through its breakdown products, of 150 nanograms per milliliter. The threshold was raised tenfold in 2013, from the 15 ng/mL level reported in that 2011 review. WADA has said the current threshold is consistent with a significantly impaired athlete or a frequent user, so a positive test usually reflects heavy or recent use.
THC also lingers. In studies cited by that 2011 review, THC breakdown products stayed above the old 15 ng/mL mark for an average of about 34 hours after a single smoked dose containing 16 mg of THC, and about 89 hours after a 34 mg dose. Those figures used the older, lower cutoff, but they show why timing matters.
CBD is where athletes get caught off guard. CBD extracted from cannabis plants may contain varying amounts of THC, which remains prohibited. Because every other natural cannabinoid is banned in competition in any amount, a "CBD" product that also contains CBG or CBN can cause trouble too. Secondhand smoke is also unlikely to explain a positive test: the 2011 review found that passive inhalation does not appear to be a plausible explanation.
For athletes subject to testing, the cautious approach is to consider every cannabis-derived product a risk, whatever its label says.
High-profile cases and what changed afterward
Nagano 1998
Canadian snowboarder Ross Rebagliati won the first Olympic gold medal in snowboarding on February 8, 1998, then tested positive for marijuana and was stripped of the medal. Within a week, the Court of Arbitration for Sport reinstated it: marijuana was banned under the international ski federation's list but not on the IOC's list.
Tokyo 2021
U.S. sprinter Sha'Carri Richardson's sample from the June 19, 2021, Olympic Trials final contained a THC metabolite. She accepted a one-month suspension, her Trials results that day were disqualified, and she did not run the 100 meters at the Tokyo Games. She had recently learned of her biological mother's death.
What changed afterward
Richardson's case prompted calls to drop cannabis from the list, and WADA began a review. In September 2022, it kept cannabis on the prohibited list after its experts concluded that cannabis use is against the spirit of sport. Rules can change, but as of October 2026 THC remains prohibited in competition. WADA's 2027 list, approved in September 2026, takes effect January 1, 2027, and adds examples to the cannabinoid section, so athletes should check the list in force before any event.
Host cities and cannabis laws for traveling fans
As of October 2026, the next Summer Games are in Los Angeles, July 14 to 30, 2028. The Winter Games head to the French Alps in 2030 and to Salt Lake City, Utah, in 2034.
If you are going to Los Angeles:
- California lets adults 21 and older use cannabis on private property, not in public places such as restaurants or bars.
- Property owners can ban cannabis, and most hotels do not allow it in guest rooms.
- Cannabis is prohibited on federal lands, such as national parks.
- Cannabis in a vehicle must be sealed or kept in the trunk, and driving impaired is illegal.
For Michigan fans, the most important point is simple: do not pack cannabis for the trip. Taking it across state lines is illegal under federal law, and TSA officers refer illegal substances they find to law enforcement. For 2030 and 2034, check local law well before you travel, and never carry cannabis across an international border.
What research does and doesn't show about recovery and performance
Cannabis use among athletes is not rare: across surveys of more than 46,000 athletes, about 23% reported using it in the past year. Evidence that it helps them perform is another matter.
- A 2020 systematic review of cannabis and sport concluded that cannabis does not appear to improve performance, though it called the research generally poor.
- Exercise studies point the same way. Reviews of them found no gain in aerobic performance and a probable loss of strength, plus reduced work capacity, a faster heart rate and more body sway after use.
- On recovery, the same 2020 review found no published research on cannabis and athletic recovery as of its 2018 search.
If you are active and curious about cannabis, talk with a sports medicine clinician first, and keep it out of training sessions. Our guide to cannabis and fitness has more.
Hosting a Games viewing party: alcohol-free options and low doses
Watching from home is the easiest way to enjoy the Games, and with Los Angeles three hours behind most of Michigan, many 2028 events will run into the evening here.
- Keep it 21+, and keep infused food and drinks away from kids and pets.
- Offer alcohol-free options. THC drinks are one; in Michigan, a cannabis beverage can hold up to 10 mg of THC per serving and 100 mg per container. Our comparison of THC drinks and alcohol explains the differences.
- Go low. Small doses keep the focus on the competition; our guide to microdosing covers the approach.
- Pace edibles. They often take 30 to 90 minutes to start, so do not take more because a race finished and you feel nothing yet.
- Do not mix cannabis and alcohol, and plan rides home.
- Label everything infused, and put out plenty of non-infused snacks.
A simple low-dose plan for a broadcast
| When | What to do |
|---|---|
| Before the broadcast | Eat a real meal and set out water and alcohol-free drinks |
| First event | If you are partaking, start with a small dose |
| Two hours in | Check in with yourself before considering more of an edible |
| After the final event | Put infused leftovers away, labeled and locked, and get a sober ride if you are leaving |
Legal reminders for Michigan viewers
- Adults 21 and older may carry as much as 2.5 ounces, with no more than 15 grams as concentrate. At home, anything over 2.5 ounces must be kept locked up.
- Sharing with anyone under 21 is not allowed, so keep infused food and drinks away from younger guests.
- Cannabis use is not allowed in public places, and a business needs a special state license plus local approval to allow on-site consumption.
- No one may use cannabis while driving, and smoking is not allowed in a vehicle on a public road.
- Michigan has no numeric THC limit for drivers, but driving while impaired is illegal, and a separate zero-tolerance law bars driving with any amount of a Schedule 1 drug, a list that includes marijuana.
- Do not take cannabis across state lines or onto federal land.
Our Michigan cannabis laws page has the full picture. 21+ only, or 18+ with a Michigan medical card. Please consume responsibly.
