Half of cannabis users think they can drive safely while high – are they right?

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It’s been several years since recreational cannabis was made legal in some US states. What effect has it had on road safety?

People who are stoned often think they’re being funnier than they actually are, now we know they overestimate their driving ability too.

Almost half of cannabis users believe it’s safe to drive when you’re high, according to a new study by PSB Research and Buzzfeed News. Perhaps unsurprisingly, those who abstain from weed, take a different view – only 14% believe someone who’s stoned can drive safely.

The dangers of driving while intoxicated have been so well established that it’s easy to assume it’s the abstainers who are right and pot-smokers are simply failing to recognize the danger they pose to themselves. But a number of studies into the issue have produced a murkier picture.

It’s true that THC, the psychoactive ingredient in cannabis, can impair a person’s levels of attention and their perception of time and speed, important skills you might think for driving a car. One meta-analysis of 60 studies found that marijuana use causes impairment on every measure of

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