Why cannabis affects people so differently depends on how you take it
Lu S, Liu X, Truong L, Liu Z, Guo F
Medicinal Plants
If you grow cannabis medicinally or know someone who does, the reason a homegrown tincture can feel barely noticeable one day and overwhelming the next comes down to the same absorption biology this review is trying to map and predict.
THC, the main active compound in cannabis, behaves unpredictably in different people's bodies, which makes consistent medical treatment tricky. Scientists looked at a dozen computer models that try to predict how the body absorbs and processes THC, and found that the biggest source of unpredictability is how the drug gets in: smoking, eating, or a standardized capsule all produce very different results, as does whether the person uses cannabis regularly. Pulling these models together into one reference collection is a step toward dosing cannabis medicine the way we'd dose any other prescription drug, matched to the individual.
Key Findings
Bioavailability of THC varied from 22% to 91% across studies, reflecting extreme absorption unpredictability tied to route of administration, formulation, and usage history.
Between-subject variability in clearance ranged 17-50% and in volume of distribution 10-57%, with absorption-phase variability consistently the largest driver across all 9 reviewed THC models.
All 12 identified population pharmacokinetic models used two- or three-compartment structures; the review consolidates them into a standardized repository to guide model-informed precision dosing.
chevron_right Technical Summary
A systematic review of 12 mathematical models reveals why the same cannabis dose hits people very differently: the drug's absorption into the body varies wildly depending on how it's taken, the formulation used, and whether someone is a regular user. Researchers compiled these models into a reference repository to help clinicians tailor cannabis-based medicine to individual patients.
Abstract Preview
Original paper
Mind the Gap: Unraveling the Pharmacokinetic Variability of Δ9-Tetrahydrocannabinol (THC).
The global rise in the legalization and medical use of cannabis has underscored the need to understand the pharmacology of its major active compound, Δ9-tetrahydrocannabinol (THC). THC displays com...
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