CBD that gets you high: why it is a warning sign

THC produces the "high" of cannabis by activating a brain receptor called CB1, and CBD does not activate it in the same way. In 2015, a study in the British Journal of Pharmacology showed in cells that CBD is a negative allosteric modulator of CB1. It binds to a different site on the receptor and dampens the effect of THC and of endocannabinoids without taking their place.

Those results come from cell cultures and explain the mechanism. The evidence that CBD does not get you high comes from trials in humans, such as the double-blind, placebo-controlled one summarised in the 2018 WHO critical review. On scales of intoxication, mood and psychotic symptoms, an oral dose of 600 mg of CBD did not differ from placebo. A 10 mg dose of THC caused intoxication and euphoria and raised anxiety and heart rate.

According to the WHO's conclusion, CBD shows no effects in humans that would indicate a potential for abuse or dependence. For a point-by-point comparison of the two molecules, read our article THC and CBD: the differences.

A substance that does not get you high can still act on the body. The documented adverse effects of CBD, and its interactions with some medicines, are covered in our article on CBD side effects.

Driving makes a good test, because a psychoactive substance degrades it quickly. In 2020, a team at Maastricht University published an on-road trial in JAMA with 26 occasional cannabis users. In random order, each vaporised four types of cannabis: CBD-rich, THC-rich, mixed and placebo. The doses were 13.75 mg of CBD, of THC, or of both.

Over 100 km, the researchers recorded how much the car weaved, expressed as the standard deviation of its position in the lane. A higher figure means more zigzagging.

With CBD-rich cannabis, the result matched placebo. THC, alone or combined with CBD, impaired driving between 40 and 100 minutes after use, and the effect was gone after four hours. For comparison, the authors note that a blood alcohol level of 0.5 g/L (0.05%) adds 2.4 cm to this weaving. They point out two limits: the difference measured with CBD does not exclude a small effect, and the doses tested may not match common use. Nor did CBD lessen the effect of THC.

Milligrams make the legal threshold easier to picture. The French order of 30 December 2021 limits the Δ⁹-THC content of hemp varieties, extracts and products containing them to 0.30%. A gram of compliant flower therefore holds at most 3 mg of Δ⁹-THC. Herbal cannabis seized in France in 2024 averaged 14.3% THC, or 143 mg per gram, and resin 29.6%, or 296 mg, according to the OFDT, France's drug observatory.

The Maastricht trial used 13.75 mg of THC. Reaching that dose would take more than 4.5 g of flower at the legal maximum, and all of its THC would have to pass into the vapour, which never happens. A full analysis also lists THCA, the acid form of THC present in the plant, which partly converts to THC when heated. Such traces will not get you high, yet they can count in a drug test, as our guide on saliva tests and CBD explains. For the threshold itself, see our article on the legal THC level.

The Court of Justice of the European Union ruled on case C-663/18, known as Kanavape, on 19 November 2020. It observed that, on current scientific knowledge, the CBD at issue "does not appear to have any psychotropic effect". Its press release summarises the conclusion: CBD cannot be regarded as a narcotic under the United Nations conventions.

France's highest administrative court, the Conseil d'État, adopted the same finding on 29 December 2022: CBD "has no psychotropic effect and does not cause dependence" and "cannot be considered a narcotic product". It annulled the ban on selling flowers and leaves, observing that their THC level can be checked with quick, inexpensive tests. Both rulings are detailed in our article is CBD a drug.

This status is unaffected by the withdrawal of CBD foods called for in the French agriculture ministry's notice of 20 May 2026. That withdrawal is based on the EU novel food regulation, since the safety of CBD as a food has not been demonstrated, and has nothing to do with a psychoactive effect. Our update on CBD regulation in 2026 separates the two issues.

A product sold as CBD that gets you high has one of two explanations, and neither is a stronger CBD. Both are illegal in France.

The first is a THC level above 0.3%. The product is then cannabis, and so a controlled drug, whatever its packaging says.

The second is a semi-synthetic cannabinoid. HHC has been a controlled drug since 13 June 2023, and H4-CBD, THCP and other derivatives since 3 June 2024. The ANSM decision behind the latter cites serious reported effects: vomiting, loss of consciousness, seizures and a racing heart. How these molecules ended up on the CBD shelf is told in our articles on HHC and H4-CBD.

Before buying, you can rule out both cases with the batch's certificate of analysis. Check the dominant cannabinoid, a Δ⁹-THC level of 0.3% at most and a batch number that matches the product. Our guide explains how to read a certificate of analysis, and the laboratory page describes the measurement methods. If a product does get you high, stop using it and do not drive.