The study involved 72 cocaine abusers, most of whom snorted the drug.
Many new asthma patients are cocaine abusers, the doctors say.
In the psychiatric emergency room, doctors variously estimate that from 50 to 90 percent of their patients are cocaine abusers.
They call out for the "cocaine abusers with no noses" and an array of more obscenely labeled types.
Similarly, many cocaine abusers stop without formal treatment.
Mr. McLarty said in court that he was a longtime cocaine abuser.
How many cocaine abusers may be involved is unclear.
Young, seemingly healthy cocaine abusers sometimes suffer chest pain or heart attacks, even though their heart arteries appear to be perfectly normal.
State health officials estimate there are 57,000 crack users and 93,000 cocaine abusers in New Jersey.
Treatment had reduced the number of cocaine abusers by two-thirds.