Final answer:
It is false that only illegal drug use can negatively affect vision and driving as both legal and illegal substances can impair driving abilities when misused.
Step-by-step explanation:
The statement that only ILLEGAL drug use can negatively alter your vision and cause a crash is False. Both legal and illegal substances can have psychoactive effects on the brain, which can alter mood, perceptions, thinking, and behavior. This means that even prescription or over-the-counter medicines, when taken in doses higher than recommended, can impair an individual's ability to operate a vehicle safely. Overdoses of illegal drugs, as well as misuse of legal drugs, can similarly lead to poor decision-making, slower reaction times, and altered vision, all of which increase the likelihood of a crash.