because they work with a lot of people and they know when they see someone unhealthy
There are three kinds of blood vessels: arteries, veins, and capillaries. Each of these plays a very specific role in the circulation process. Arteries carry oxygenated blood away from the heart. They're tough on the outside but they contain a smooth interior layer of epithelial cells that allows blood to flow easily.
Explanation:
The only person that is negatively affected by drug use is the addict.
Prolonged use of psychoactive drugs can cause brain damage
Illegal drug use often leads to more illegal behavior.
