: a person who frequently or habitually uses illicit drugs
- He was a doper. He was loaded right now. Speed maybe. Or coke.
- —Joseph Wambaugh
: a person who sells illicit drugs
- "Dopers are right on the cutting edge of technology," says Jimmy Davis of the Georgia Bureau of Investigation. "It used to be that you weren't a certified dope dealer unless you had a beeper. Now you're not a big-time dope dealer unless you're cellular."
- —Terry E. Johnson et al.
: an athlete who uses performance-enhancing substances typically banned for use in sports
- Already athletes from Great Britain and Australia who finished behind drug-using East Germans have begun asking Olympic officials to disqualify the dopers and rewrite the record books accordingly.
- —Sports Illustrated
- Human growth hormone is another protein, already widely abused by dopers, that builds muscle and aids recovery.