A study that followed drug users in London, Ont., who were given prescription opioids instead of using street supplies has found over a third stopped using intravenous drugs.The findings were released Thursday by the Intercommunity Health Centre. The harm reduction program’s year-long study followed 248 people living with addiction on the streets of London between April 1 2020 and Sept. 31, 2021, after researchers received Health Canada funding in March of 2020.