Weed and Alcohol: Impairment, THC Levels, and Driving
Drinking alcohol alongside cannabis is not simply doing two things at once. In controlled dosing studies, alcohol significantly raised peak blood THC, and at the higher cannabis dose it raised it by more than half. On the road the two combine worse than either alone: in a case control study of fatally injured drivers, testing positive for both carried an adjusted odds ratio of 25.09 against 16.33 for alcohol alone and 1.54 for cannabis alone. Here is what the pharmacology shows, how strong the crash evidence actually is, and what the driving law says in Florida, Georgia, and Texas.
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