Studies indicate that Asian-American adolescent girls in the U.S. are the least likely use marijuana.
Studies indicate that tolerance and dependence develop at a similar rate with both heroin and Opana use.
The FDA has urged physicians to use great caution when prescribing methadone, because of the potential for respiratory distress and dangerous changes in an individual's heart beat that cannot be felt by the patient.
Using crack cocaine can result in constricted blood vessels, increased temperature, heart rate, and blood pressure, and risk of cardiac arrest and seizure.