Everything in this study was measured with the same instruments in both countries — which is what makes the contrast decisive rather than anecdotal.
The contrast in one table
| Dimension | UK | US |
|---|---|---|
| Legal frame | CBD wellness legal (FSA Novel Foods); THC illegal recreationally; medical via private clinics | Recreational + medical legal state-by-state; federally grey |
| Demand mix | Medical 49% / Wellness 47% / Rec 4% | Wellness 53% / Rec 26% / Medical 21% |
| Lead use-case | Epilepsy (143K/mo — Epidyolex) | Sleep (1.1M/mo) |
| Lead forms | Creams 272K · drinks 89K | Pet 192K · oils 92K (+ dispensary flower/vape) |
| Commercial actors | H&B + CBD brands + private clinics | Dispensary-tech (Leafly, Weedmaps) + brands |
| Consumer question | "Is it legal — and will it help me?" | "Where and how do I buy?" |
| Category trajectory | Smaller, gently rising | 58M→79M searches/yr, then plateau |
What the divergence means
The category is the same; the buying problem is not. UK buyers need reassurance and access — legality, safety, clinic routes. US buyers need navigation and selection — state rules, dispensary choice, product comparison. Content, SEO and AI-answer strategy must localise to the buying problem, not just the spelling.
What is genuinely shared is the evidence core: the licensed indications (epilepsy, MS spasticity, chemo nausea), the safety and quality-assurance story, and the sleep/anxiety/pain testimony base. That shared core is the citable substance both markets' AI answers are starved of.
The GEO angle, measured: in both countries regulators and health-information sites dominate AI-answer citations while commercial brands largely vanish — the same reshuffle we measured in the UK weight-loss market. Building referenced, indication-aware authority content is the whitespace on both sides of the Atlantic; measuring your citation share monthly is how you know it is working.
Every claim on these pages traces to the corpus — 155,012 evidence snippets, 87-month demand series, 4,940 AI citations. Test that claim yourself: ask the cannabis study chatbot.