Consuming what substance before or while driving, can make you unfit to drive?

Consuming cocaine, alcohol, or hashish before or while driving can impair your ability to operate a vehicle safely. According to German traffic laws, these substances affect your concentration, reaction time, and judgment, making you unfit to drive. Driving under the influence of any of these drugs is illegal and can lead to serious accidents and legal consequences. Therefore, all three substances are recognized as impairing your fitness to drive, not just one or two.