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Effect of Cannabidiol and Δ9-Tetrahydrocannabinol on Driving Performance: A Randomized Clinical Trial

In studying the effects of THC-dominant, THC/CBD-equivalent, and CBD-dominant cannabis on driving performance, it was found that there was little difference between THC-dominant and the THC/CBD-equivalent cannabis. Both of those were show to significantly impair the driver under experimental conditions when cognitive function and subjective experiences were assessed. Alone, the CBD-dominant cannabis did not impair driving.

by Arkell  TR, Vinckenbosch  F, Kevin  RC, Theunissen  EL, McGregor  IS, Ramaekers  JG. 

Read the full report at JAMANetwork.com.