Long-term use of OxyContin both legitimately and illicitly causes the body to adapt to the presence of the drug and withdrawal symptoms occur if use is reduced or stopped.
Marijuana use and early use of other illicit drugs during adolescence make an individual more likely to continue using marijuana in their mid-30s or beyond.
There are increased rates of heavy alcohol consumption amongst those with less than a college degree.
Marijuana users entering substance abuse treatment in the U.S. are most likely to not be in the workforce, that is, unemployed or students.