If that's the conclusion you'd also expect 40% of the population using it.
Remember that not all the population drives, nor are accidents randomly distributed in the population.
https://injuryfacts.nsc.org/motor-vehicle/overview/age-of-dr... https://injuryfacts.nsc.org/motor-vehicle/overview/crashes-b...
”That generally matches the profile of the stereotypical THC user”
Got a source for that claim?