CBD does not have the same "high" as THC, which leads many users to believe it has no effect on driving. The reality is more nuanced: studies on driving are rare, traffic stops test for a different compound, and a product’s actual composition does not always match what’s listed on the label. Here are the key points to keep in mind before hitting the road.
What the benchmark driving test reveals
Wholesale CBD oils are among the most popular products among retailers, who are regularly asked the same question by their customers: Can you drive afterward? The main scientific answer comes from a study published in 2020 in the journal JAMA by the team led by Arkell and Ramaekers (Maastricht University), which tested actual driving on the road.
Twenty-six healthy occasional users inhaled four types of vaporized cannabis: THC-dominant, CBD-dominant, a balanced blend, and a placebo, each containing 13.75 mg of THC or CBD, as appropriate. The measured outcome was the degree of lane deviation over 100 km. The THC-containing strains increased this deviation within 100 minutes of consumption, whereas the CBD-dominant strain did not differ from the placebo.
The authors note that the effect size is not sufficient to rule out any significant change and that the doses tested do not always reflect typical usage. The group was also young and small, with only one method of administration.
Tests that target THC
Saliva tests conducted during traffic stops screen only for THC. However, even legal products contain trace amounts of THC, and a study cited by Ryan Vandrey’s team (Johns Hopkins) reports that 21% of CBD products sold online contained THC that was not listed on the label. For information on how long the molecule remains in the body, see “How Long Does CBD Stay in the Blood?”
A positive test result can lead to penalties even if the product was purchased legally. The batch analysis certificate, which details the actual THC content, is therefore a valuable document to keep on file.
Inhalation or oral exposure: different time frames
The timing of drowsiness depends on the method of administration. When inhaled, the compound enters the bloodstream quickly, and the effects are felt within a few minutes. When taken orally—as an oil or an infusion—absorption is slower and varies more from person to person, making it harder to predict when the effects will set in.
The Maastricht study focused on vaporized flower, and no real-world driving study has tested ingested oil. The conclusions therefore cannot be applied directly to all products, which calls for caution after an initial trial or a change in product.
Practical Precautions Before Getting Behind the Wheel
CBD can cause drowsiness in some people, especially when trying it for the first time or at high doses. It’s best to try a product on a day when you won’t be driving, observe how you react, and then decide. Avoid combining it with alcohol or medications that impair alertness, and consult a doctor or pharmacist if you are taking any medications.
Professional drivers or those subject to regular testing should choose products certified to be THC-free, such as isolates, and keep their certificates of analysis.
Before getting behind the wheel: three tips
Wait to see how you react, as drowsiness varies from person to person. Request the analysis certificate that lists the THC level of the batch. Check local laws, as a positive THC test is still punishable regardless of the product’s legal status. A reputable CBD wholesaler provides analysis data with each batch, allowing its customers to address these issues accurately.