The cocaine intended for use in the United States is mainly produced in South American labs.
The rate of annual use of marijuana had been on a steady decline between 2002 and 2007, then increased from 2008 to 2009 at which time use was slightly higher than the 2002 rate.
Methamphetamine can be taken in a variety of ways including smoking, injecting, snorting, swallowing, or inserting the drug into the anus.
Treatment for stimulant withdrawal may include a regimen of drugs that increase neurotransmitter production, due to the depression and dysphoria caused by sudden cessation of use.