INTERVENTIONALRECRUITINGNCT04325958

The Influence of Age on Driving-related Cannabis Effects: Exploring Cannabis Use Frequency and Related Factors

Epidemiological studies suggest that the use of cannabis is associated with an increase in the risk of motor vehicle collisions. It is also known that younger users may be at increased risk for motor vehicle collisions. Further, the frequency with which cannabis is used may be an important variable in determining the effects of cannabis on driving. The purpose of the present study will be to investigate the effects of cannabis on simulated driving in young as compared to middle-aged drivers. Half of the participants will be occasional users of cannabis and half will be frequent users of cannabis.

Locally preserved from ClinicalTrials.govOpen ClinicalTrials.govlast source update 2026-03-23

What this record can show

Protocol only - no registry results posted

This locally preserved record separates the registered protocol from source-reported registry results. Neither is a treatment recommendation.

Registry facts

Study at a glance

Phase: NA
Enrollment: 128 (ESTIMATED)
Start date: 2024-03-27
Sponsor: Centre for Addiction and Mental Health
Design: NON RANDOMIZED · CROSSOVER · BASIC SCIENCE
Locations: 1
Results record: Not present in registry snapshot

Epidemiological studies have established that the use of cannabis can increase the risk of a motor vehicle collision. A number of variables can influence the effects of cannabis on driving. For example, frequent users of cannabis have been shown to have different cognitive and physiological responses to cannabis as compared to occasional users. In addition, we know that younger drivers are more likely to be involved in motor vehicle collisions after alcohol use as compared to older users. The contribution of age and experience with cannabis on cannabis-mediated effects on driving have yet to be delineated in laboratory studies. The purpose of the present investigation will be to determine whether cannabis has different effects on driving in young, as compared to middle aged, drivers. Half of each age group will be occasional users of cannabis and the other half will be frequent users. Eligible participants will attend the laboratory for two test sessions; in one session they will smoke a cannabis cigarette and in the other they smoke a placebo cigarette. Participants will drive a driving simulator before and after smoking the cigarette. Blood for measurement of THC and metabolites will also be collected before smoking the cigarette and at a number of times after smoking. Subjective and cognitive tasks will be completed before and after smoking. It is hoped that the findings of this study will help to inform public perception and policy into the potential effects of cannabis on driving.

Linked local records

Related local records

Local links use governed condition terms or exact source-reported intervention names. They are navigation candidates, not efficacy claims.

Conditions

No published condition report matched.

Cannabinoids and active compounds

No governed compound link was found.

Medicines

No exact medicine-name link was found.

Population and criteria

Sex

ALL

Minimum age

19 Years

Maximum age

45 Years

Healthy volunteers

Accepted

Inclusion criteria

19-25 or 35-45 years of age;
Use of smoked cannabis at least once in the past 6 months.
Use of smoked or vaped cannabis primarily for recreational purposes on up to 1 day per week or on at least 6 days per week in the past 3 months;
Holds a class G or G2 Ontario driver's licence (or equivalent from another jurisdiction) for at least 12 months;
Willing to abstain from using alcohol for 24 hours and cannabis for 72 hours prior to Practice and Test Sessions;
Willing to abstain from all other drugs not prescribed for medical purposes for 48 hours prior to Practice and Test Sessions;
Resides within Toronto (study site) or can reside with friends/family in Toronto after a Test Session; this area may be extended to the Greater Toronto area if recruitment challenges arise;
Participant willing to use appropriate contraception until their participation in the study is completed;
Provides written and informed consent.