What is the purpose of the central nervous system

In some states, medical marijuana is legal. this means that people who need to take marijuana because of a medical condition may take it only with approval from the doctor. however, officers still advise these people not to drive while under the influence.what is the main reason for this? they would become dangerous to themselves and other people.they would not able to read and follow street signs.they would not be capable of staying in only one lane.they would become dangerous to wildlife that may be present.

In which way does nicotine cause addiction? by stimulating the brain's pleasure center by increasing blood-sugar levels by decreasing dopamine levels by reducing depression and anxiety

Why do you need two different circuits of blood vessels in your body?