Drug addiction (dependence) is compulsively using a substance, despite its negative and sometimes dangerous effects. Drug abuse is using a drug excessively, or for purposes for which it was not medically intended. A phy...
Opioids are a class of drugs that include both natural and synthetic substances. The natural opioids (referred to as opiates) include opium and morphine.
Cocaine is extracted from the coca plant, which grows in Central and South America. The substance is processed into many forms for use as an illegal drug of abuse.
Cannabis, more commonly called marijuana, refers to the several varieties of Cannabis sativa , or Indian hemp plant, that contains the psychoactive drug delta-9-tetrahydrocannabinol (THC).