What is actually responsible for problems often linked to drugs?

Description
What many Americans, including many scientists, think they know about drugs is turning out to be totally wrong. For decades, drug war propaganda has brainwashed Americans into blaming drugs for problems ranging from crime to economic deprivation. In High Price: A Neuroscientist’s Journey of Self-Discovery That Challenges Everything You Know About Drugs and Society (Links to an external site.), Carl Hart explains this how? Clearly list 3 distinct examples and then go on to explain each of them.
Regardless of the option you select address the following in the conclusion of your essay:
What is actually responsible for problems often linked to drugs?
Is Hart’s position to keep drugs illegal, decriminalize or legalize illicit drugs?