General symptoms of drug addiction from the Mayo Clinic.
The National Institute on Drug Abuse site on heroin addiction and recovery. Detailed information about the effects of heroin.
Information from a treatment center on the physical and psychological impact of heroin addiction
Information on heroin use and treatment from Erowid.com, a drug legalization group
Wired in Recovery's Youtube channel featuring an English documentary about heroin addiction.
A Canadian junkie shoots up and tells his story. Hearing him ratioanlize and explain his addiction is fascinating: Part 1, Part 2
How to use heroin. Don't try this at home.
