Needle sharing for drug use involves the most direct risk of infection with HIV. People exchanging sex for drugs are also at high risk.
by injection of heroin
I would say Drug and Alcohol abuse is the most common among all ages.
Alcohol is by far the most abused drug. It's also one of the few addictive drugs that people who 21 and over can buy over the counter. Most people do not view it as a drug, despite the devastating consequences of alcohol abuse.
The most pressing issues for social reform include poverty, racial tension, and drug abuse. There are many societal problems, but some more serious ones are poverty, racial tension, and drug abuse.
Do you mean the country that has most drug abusers, or the country that is doing most to eradicate drugs? If the former, it's probably the USA.
Most definitely. We are all responsible for our own behavior.
A hallucinogen. Most are dangerous. People abuse these to escape from what they perceive to be a painful reality, rationally or not.
They are still trying to find out, but the doctors have predicted that it was most probably drug abuse.
liver, kidney
NA - Narcotics Anonymous operates in most areas and are available in the yellow pages. Most localities have help lines, and certainly calling an emergency room will guide you to local help. Most localities also have a Drug & Alcohol abuse service center - usually on a county level for help.
kidney n liver
If it is tested it will show up. Most "drugs of abuse" panels do include it.