# Cannabis Edibles with Alcohol: Effects on Driving, Sobriety & Subjective Experience > **Author:** Benjamin Caplan, MD (ABFM Board Certified, MA Lic. #240562, NPI: 1962722637) > **Publisher:** CED Clinic (https://cedclinic.com) > **Canonical URL:** https://cedclinic.com/cannabis-edibles-alcohol-interaction-driving-risks/ > **Published:** 2026-05-08T16:13:45-04:00 | **Last Modified / Clinically Audited:** 2026-09-28T17:01:39-04:00 > **Clinical Summary:** Explore cannabis edibles and alcohol interaction and their combined effects on driving impairment and sobriety in this clinical overview. --- Table of Contents - [Clinical Takeaway](#Clinical_Takeaway) - [#7 Impact of Cannabis Edibles Combined With Alcohol on Driving, Field Sobriety Performance, and Subjective Effects: A Within-Participant Crossover Trial.](#7_Impact_of_Cannabis_Edibles_Combined_With_Alcohol_on_Driving_Field_Sobriety_Performance_and_Subjective_Effects_A_Within-Participant_Crossover_Trial) - [What This Study Teaches Us](#What_This_Study_Teaches_Us) - [Why This Matters Clinically](#Why_This_Matters_Clinically) - [Study Snapshot](#Study_Snapshot) - [Where This Paper Deserves Skepticism](#Where_This_Paper_Deserves_Skepticism) - [Dr. Caplan’s Take](#Dr_Caplan8217s_Take) - [Clinical Bottom Line](#Clinical_Bottom_Line) - [Related](#Related) #### Clinical Takeaway Combining [cannabis edibles](https://cedclinic.com/decarboxylating-cannabis-process-why-how/) with alcohol produces greater driving impairment than either substance alone, based on controlled crossover trial data. Both substances independently worsened simulated driving performance and field sobriety measures, with co-use amplifying these effects. Patients should be clearly counseled that using cannabis edibles alongside alcohol significantly increases impairment risk, including for driving. ### #7 Impact of Cannabis Edibles Combined With Alcohol on Driving, Field Sobriety Performance, and Subjective Effects: A Within-Participant Crossover Trial. **Citation:** Zamarripa C Austin et al. *Impact of Cannabis Edibles Combined With Alcohol on Driving, Field Sobriety Performance, and Subjective Effects: A Within-Participant Crossover Trial.* JAMA network open. 2026. PMID: 42065887. **Study type:** Journal Article, Randomized Controlled Trial  |  **Topic area:** THC Pharmacokinetics  |  **CED Score:** 12 Design: 5 Journal: 4 N: 0 Recency: 3 Pop: 1 Human: 1 Risk: -2 **Quality Gate Alerts:** - Preclinical only **Abstract:** IMPORTANCE: Simultaneous [cannabis and alcohol](https://cedclinic.com/can-you-mix-weed-and-alcohol/) use (co-use) is a public safety concern. Controlled data on the effects of co-ingestion of oral cannabis products (edibles) with alcohol are lacking, despite an increased prevalence of this behavior. OBJECTIVE: To evaluate the individual and interactive effects of cannabis edibles and alcohol on simulated driving and subjective and objective impairment measures. DESIGN, SETTING, AND PARTICIPANTS: This within-participant, double-blind, double-dummy crossover study of healthy adults included 7 outpatient sessions, separated by 1 week, at Johns Hopkins University School of Medicine from February 2022 to August 2025. INTERVENTION: Brownies containing 0 mg, 10 mg, or 25 mg Δ9-tetrahydrocannabinol (THC) combined with placebo drinks or alcohol-containing drinks, calculated to achieve breath alcohol concentrations (BrACs) of 0%, 0.05%, or 0.08%. MAIN OUTCOMES AND MEASURES: Driving outcomes included the global drive score (GDS), a composite index of multiple driving measures, and the standard deviation of lateral position as the main outcomes. Other outcomes included cumulative impairment clues on standardized field sobriety tests (SFSTs), subjective drug effects, cognitive and psychomotor performance (using the DRUID [Driving Under the Influence of Drugs] application), and blood cannabinoid concentrations. RESULTS: Participants included 25 healthy adults (15 males [60%]; mean [SD] age, 25.6 [4.9] years) who reported recent binge drinking, prior [cannabis and alcohol co-use](https://cedclinic.com/low-dose-thc-beverages-bill-new-york/), and fewer than 3 cannabis uses per week. Compared with placebo, all active drug conditions except 10 mg THC negatively impacted driving performance (ie, GDS). Driving impairment from alcohol alone at 0.08% BrAC was comparable with that of 0.05% BrAC and 10 mg THC (mean [SD] GDS, 1.6 [1.6] vs 1.6 [1.4]) and significantly lower than 0.05% BrAC and 25 mg THC (mean [SD] GDS, 2.5 [1.7]; P = .02). Driving impairment and subjective intoxication (eg, confidence to dri ### What This Study Teaches Us Cannabis edibles and alcohol produce measurable impairment on simulated driving tests, with most active drug combinations (except 10 mg THC alone) worsening performance compared to placebo. The impairment from 0.08% breath alcohol was comparable to that from 10 mg THC, suggesting both substances carry meaningful driving risk at these doses. ### Why This Matters Clinically Co-use of cannabis edibles and alcohol is increasingly common, but we’ve had almost no controlled human data on how they interact during driving. Clinicians counseling patients about cannabis, alcohol, or both need concrete information to discuss real-world safety, and this study provides the first rigorous evidence in a driving simulator. ### Study Snapshot **Study Design**Within-participant double-blind double-dummy crossover trial with 7 sessions separated by 1 week**Population**25 healthy adults (60% male, mean age 25.6 years) with recent binge drinking, prior cannabis-alcohol co-use, and less than 3 cannabis uses per week**Intervention**THC edibles (brownies containing 0, 10, or 25 mg THC) combined with placebo or alcohol drinks targeting breath alcohol concentrations of 0%, 0.05%, or 0.08%**Primary Outcome**Global drive score (composite index of multiple driving measures) and standard deviation of lateral position on simulated driving task**Key Result**All active drug conditions except 10 mg THC alone [impaired driving](https://cedclinic.com/cannabis-impairment-detection-driving-safety/) performance; 0.08% BAC impairment was comparable to 10 mg THC impairment ### Where This Paper Deserves Skepticism The sample is small (N=25) and restricted to young adults with recent binge drinking and prior co-use experience, so findings may not generalize to older users, infrequent users, or those without a history of combined use. A simulated driving test measures only intermediate performance outcomes, not crash risk in real traffic. Funding source is not mentioned in the abstract. ### Dr. Caplan’s Take This is the kind of study we’ve been missing. The controlled setting at Johns Hopkins with blinded dosing gives us real signal on a behavior that’s already happening in the real world. What I take from this: a single 10 mg THC edible appears to produce less driving impairment than we might have expected, but 25 mg does not, and the interaction with alcohol matters. I’m cautious about over-interpreting the 10 mg finding in isolation because sample size is modest and individual variation is real, but the overall message is sound: combining these substances merits explicit [patient counseling](https://cedclinic.com/stroke-risk-assessment-substance-use/). ### Clinical Bottom Line In this controlled trial, cannabis edibles at 25 mg THC and most combinations with alcohol measurably impaired simulated driving, with effects comparable to legal intoxication thresholds. Clinicians should advise patients that co-use carries documented driving risk and counsel against driving after combined cannabis and alcohol use.  |   |  [View on PubMed ↗](https://pubmed.ncbi.nlm.nih.gov/42065887/)[Full Text ↗](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13135220/)[DOI ↗](https://doi.org/10.1001/jamanetworkopen.2026.9842) [https://cedclinic.com/contact/](https://cedclinic.com/contact/) Physician-Led, Whole-Person Care A doctor who takes the time to truly understand you. 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Share it: [X Share on X](https://twitter.com/intent/tweet?text=Just%20read%20this%20on%20CEDclinic.com%3A%20Cannabis%20Edibles%20with%20Alcohol%3A%20Effects%20on%20Driving%2C%20Sobriety%20%26%20Subjective%20Experience%20%40drcaplan&url=https%3A%2F%2Fcedclinic.com%2F%3Fp%3D50818)[in Share on LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fcedclinic.com%2F%3Fp%3D50818)[🦅 Share on BlueSky](https://bsky.app/intent/compose?text=Just%20read%20this%3A%20Cannabis%20Edibles%20with%20Alcohol%3A%20Effects%20on%20Driving%2C%20Sobriety%20%26%20Subjective%20Experience%20via%20%40drcaplan.bsky.social%20https%3A%2F%2Fcedclinic.com%2F%3Fp%3D50818)[📷 Follow on Instagram](https://www.instagram.com/drbenjamincaplan)[📝 Read more on Substack](https://doctorapprovedcannabis.substack.com/)[🔔 Subscribe via RSS](https://cedclinic.com/feed/) RELATED READING AT CED CLINIC Continue exploring the evidence [Cannabis Edibles and Alcohol Interaction: Clinical Evidence for Safe Dosing in Family Medicine](https://cedclinic.com/cannabis-edibles-alcohol-interaction-safe-dosing/) Review clinical evidence on safe dosing when combining cannabis edibles with alcohol, focusing on family medicine implications. [Learn More](https://cedclinic.com/cannabis-edibles-alcohol-interaction-safe-dosing/) [Co-use of Cannabis Edibles and Alcohol Increases Driving Impairment, suggests JAMA study](https://cedclinic.com/co-use-of-cannabis-edibles-and-alcohol-increases-driving-impairment-suggests-jama-study/) Explore findings from a JAMA study highlighting increased driving impairment from co-use of cannabis edibles and alcohol. [Read Study](https://cedclinic.com/co-use-of-cannabis-edibles-and-alcohol-increases-driving-impairment-suggests-jama-study/) [Cannabis Edibles and Alcohol Combined Make Driving More Dangerous Than Either Alone, Johns Hopkins RCT Finds](https://cedclinic.com/cannabis-alcohol-co-use-driving-risk-rct/) Johns Hopkins randomized controlled trial reveals the amplified driving risks when cannabis edibles and alcohol are combined. [Discover Insights](https://cedclinic.com/cannabis-alcohol-co-use-driving-risk-rct/) ### Related --- ### Verification & Medical Governance - **Lead Clinical Author:** Benjamin Caplan, MD - **Credentials:** Board Certified in Family Medicine (ABFM), Founder & CMO CED Clinic & CED Foundation, Author of *The Doctor-Approved Cannabis Handbook* (Penguin Random House). - **Clinical Scale:** 350,000+ lifetime evaluations overseen; 81,008-patient Real-World Evidence Registry (`~/.ced_rwe_vault.db`); 125,000+ peer-reviewed study literature observatory (`http://localhost:8768/api/explorer/terminal`). - **License Verification:** Commonwealth of Massachusetts License #240562 (https://checkahealthlicense.mass.gov/). - **NPI Registry:** 1962722637 (https://npiregistry.cms.hhs.gov/provider-view/1962722637). - **Ethics & Data Privacy:** Clinical registry observations adhere strictly to HIPAA Safe Harbor de-identification (45 CFR § 164.514(b)) and criteria for secondary research exemption under 45 CFR § 46.104(d)(4).