The New Zealand Drug Foundation study found half of all party drug users and 58 per cent of cannabis drivers thought being high or stoned made no difference to their driving ability.
I have heard cannabis users argue they are safer when stoned - apparently they are more chilled and drive slower. But - as the TV ad attempts to show - their reactions are also slower.
Today, we report how just seven people were caught and charged with drugged driving in Rotorua in 2016. To me, that doesn't seem like a lot. Given the drug use in the city, I would bet my house there were more people than that driving on our roads stoned or high last year.
The problem is, unlike alcohol-impaired drivers, it may not always be obvious who they are - which does make it tricky for police.
Technology is being developed to help with that and, in my view, it can't come soon enough. Let's get drugged drivers off our roads because, despite what they may think, they are a danger to all other road users.