Small doses of CBD do not appear to have a significant effect on driving, according to the first study of its kind published last week in the Journal of the American Medical Association.

However, similar doses of THC were associated with short-term driving impairment, “small in magnitude and similar to that observed in drivers with 0.05%” blood alcohol concentration. According to the study, the “impairment” caused by marijuana use disappears after about four hours.

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