**Drugs** can severely affect a person's ability to drive safely. Among the effects they can cause are **optical illusions** or hallucinations. For example, **ecstasy** and **LSD** are drugs that can provoke hallucinations, making the driver see things that are not really there or perceive the environment in a distorted way. This can lead to serious errors at the wheel, as the driver might react to stimuli that do not exist.

Additionally, **cannabis** can make colors appear different, which is also a form of optical illusion. These altered visual effects can impair the driver's ability to judge distances and speeds correctly, increasing the risk of accidents.

Therefore, it is crucial to avoid drug consumption before driving, as they can cause optical illusions and other dangerous effects that compromise road safety.