--  Have abused opioids for 23 years; tolerance was high at one time
--  Currently - Do not use opioids on a daily basis; 2 or 3 times per week at most; however cannot quit completely
--  Intravenous heroin was DOC until the heroin began being cut with fentanyl to the point there is no heroin present
--  Cannot tolerate fentanyl, even in very small doses; have strong adversion to fentanyl
--  Therefore, have reverted back to abusing oxycodone, when available