Low prices and increased purity have caused heroin use to skyrocket in Massachusetts, with a new study showing the drug is the No. 1 reason for admissions to treatment programs and hospital detox units as well as overdose deaths. "This is a drug epidemic permeating every corner of our commonwealth, and as a society, we need to aggressively fight to end the human suffering," said Dr. Howard Koh, commissioner of the Department of Public Health, which issued the report yesterday. "Heroin deaths are suffocating our society," he said. The DPH report showed heroin is the most common drug for which...