**Cannabis** negatively affects driving in several ways. One of the most important effects is that it **increases drowsiness**, meaning the driver may feel more tired and is more likely to fall asleep at the wheel. This is extremely dangerous as it decreases the ability to maintain attention and react appropriately to situations on the road.

Additionally, cannabis can also cause the driver to perceive the environment differently, misjudge distances, and lose concentration. All these factors contribute to a higher risk of accidents. Therefore, it is crucial to avoid driving under the influence of cannabis to ensure road safety.