The daily use of Cannabis medicine results in a complete tolerance to the psychoactive effects of THC due to the receding of CB1 receptors in the central nervous system, specifically the brain, and thus there is no impairment in the ability to operate a motor vehicle.

https://youtu.be/06rFDlvmICM

Recreational use is most often neither based on consistent strain and concentration of product as the user is seeking very different results than that of a medicinal user.

A medicinal user spends a great deal of time and effort finding the exact dosage , concentration, and specific product to use, and then strives to maintain a systemic daily dose.

this method of medicinal administration results in a complete tolerance to the psychoactive effects of THC but a recreational user is usually seeking the 'high' from THC and thus uses the product much differently