A cannabis half-life chart shows how long the body takes to clear half of a given dose of THC, CBD, or their metabolites. For most occasional consumers, THC has a distribution half-life of roughly 1.5 to 4 hours and a terminal half-life near 20 to 30 hours once it works out of fatty tissue. That gap is why the noticeable high fades in a few hours while a drug test can still pick up metabolites days later.
Cannabis Elimination Half-Life: Definition and THC Ranges
Key Features
- Half-life estimates for THC, 11-OH-THC, THC-COOH, and CBD in one reference
- Distribution phase versus terminal elimination phase, shown separately
- Different ranges for occasional, daily, and long-term heavy users
- Detection windows by sample type: urine, blood, saliva, and hair
- Notes on how body fat, dose size, and route of use shift the numbers
- The five-half-life rule for estimating near-complete clearance
- Side-by-side layout for comparing cannabinoids at a glance
What the Numbers Actually Mean
Half-life is a rate, not a stopwatch. THC is lipophilic, meaning it settles into fat tissue and re-enters the bloodstream slowly, so the terminal phase drags well past the psychoactive window. Its first metabolite, 11-OH-THC, is active and roughly as potent as THC itself, while THC-COOH is inactive and is the compound most urine screens target. CBD behaves differently, with a reported half-life of about 18 to 32 hours and far less fat storage. Liver enzyme activity, body composition, dose, and whether the product was inhaled or eaten all move these figures, so treat any chart as a range rather than a fixed clock.
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How long does THC stay detectable?
Urine screens typically catch metabolites for about 3 days after a single use and 30 days or more in heavy daily users, while blood clears in 1 to 2 days, saliva in 1 to 3 days, and hair can hold traces for up to 90 days.
CBD Half-Life in Humans: How Long It Stays Active
Does a long half-life mean a longer high?
No. The felt effects track the plasma peak and fade within hours, while the long terminal half-life reflects slow release from fat stores, which matters more for testing than for how you feel.
Why do heavy users clear THC more slowly?
Repeated use builds up stored cannabinoids and can alter enzyme activity, stretching the terminal half-life from about a day to several days.