UPI reports a new analysis reveals heroin use in the United States has nearly doubled since 2002.<br />So have health problems related to injecting of the drug.<br />Researchers from the Journal of the American Medical Association estimate 0.32 percent of the American population took the illegal drug in 2018.<br />That's up from 0.17 percent in 2002.<br />In addition, the percentage of those who inject the drug increased from 0.09 percent of the population in 2002 to 0.17 percent in 2018.