The U.S. government has two different methods to deal with illegal drug use. First, the government has tried a "war on drugs", with the idea of keeping illegal drugs out of the country

Second, the "Just say no" campaign has been used to make individuals more aware of the harmful effects of drugs. Use supply and demand to analyze the effects of these two separate policies.

The "war on drugs" leads to a reduced supply of drugs. The decrease in supply pushes the equilibrium price up and the equilibrium quantity down. The "Just say no" campaign is designed to reduce the demand for drugs. This will lower both the equilibrium price and quantity.