Hi and welcome, I'm the mother of a 22 yr old heroin addict who is in and out of recovery.
One thing you are probably thinking is that your situation is different. Believe me it's not. You'll find alot and I mean alot of similarities in behaviors between all the addicts and all the drugs. Addiction is a disease not a specific disease for each drug or each addict. you'll find so much information on this website that your head will spin, but knowledge is power, the more you learn the more you can HELP your addict.
Good luck and prayers