Doesn't matter if more or less or whatever. The point is people can be effected to the point of not being able to drive. In my opinion it is a psychoactive psychedelic and set and setting are a factor in impairment. It is a wild card. One day you can be puffin and it's all good and for whatever reason one day you fire up a new strain and boom, you are waxed and exploring some mental introspective angle. Point being is that I think a scale is not applicable here and basically a length of time should be more of an observation point. A 2 hr. window is my vote. No driving within 2 hours of smoking and the device should test for nano particles residing in the mucosa that expel drastically after 2 hours from last toke.
With psychoactive substances it is more difficult to create a scale of tolerance as the effects very wildly from subject to subject which can be dependent on current mental state prior to ingestion of psychoactive substance. If anyone doesn’t understand then research the classification of MJ. It is a psychoactive and not a stimulant nor a depressant. It is a psychedelic.
One also has to consider the cocktail of pharms that our society is on. A certain cocktail with MJ thrown in can mutate and turn on someone even after a small hit of a potent mental load strain. A depressant such as alcohol is much easier to manage in terms of effect to ingestion ratio. Not the case for a psychoactive compound. Not many people are talking this angle yet.
News 
Market Data 
Discover 
