In the largest study of its kind - 191 regular cannabis users who smoked as they “would at home to get high” - published in JAMA Psychiatry, this CMCR randomized trial examined the magnitude and time course of driving impairments due to acute cannabis use, and whether different THC content levels in cigarettes affect driving performance. The authors also report on whether a person’s use history and the development of behavioral tolerance results in less of a driving decrement, as well as whether users are accurate in self-evaluating whether they are safe to drive.

Link to the publication in JAMA Psychiatry and listen to a discussion with the authors below.

Read UC San Diego's News Center press release "Flowered steering: How well do drivers fare after smoking cannabis?" here.

Read UC San Diego Guardian's article "UCSD Health studies cannabis consumption on driving ability" here

Read a comment in Psychology Today entitled, "Self-perception doesn't predict readiness to drive after cannabis use" here

Read The New York Times' article "Is driving high as dangerous as driving drunk?" here