In general, consumption of marijuana causes people to feel euphoric, relaxed and experienced heightened sensory capabilities. Some will also experience sleepiness, lack of concentration, forgetfulness and an altered perception of reality - not exactly the best conditions for operating a vehicle.
When you drive a vehicle, you need to be alert and focused. Consuming even small amounts of cannabis affects your ability to react and increases your chance of being in a crash. Cannabis can impair your ability to drive by:
- affecting motor skills
- slowing reaction time
- impairing short term memory and concentration
- causing drivers to vary the driving speed and to wander
- reducing the ability to make decisions quickly or handle unexpected events
As you can imagine, it is not safe to drive while high on cannabis (or meth, painkillers, or any other drugs).