PCP is a synthetic drug known as a "dissociative" drug, distorting perceptions of sight and sound and producing feelings of detachment.
Methamphetamine may dry mucosa which may then lead to more chafing and abrasions in the genital area, which could make methamphetamine users more susceptible to HIV during sexual activity.
Physical changes associated with methadone are similar to other opiates and may include a suppressed cough reflex, drowsiness, and constipation.
There are increased rates of heavy alcohol consumption amongst those with less than a college degree.